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唐松草屬六新種

2017-05-30 10:48:04王文采
廣西植物 2017年6期

摘要: 描述了毛茛科唐松草屬六新種:(1)大關唐松草,發現自云南東北部,與多枝唐松草甚為近緣,區別為其小葉較厚,較大,多呈卵形或寬卵形,心皮花柱較短,稍向后彎曲,瘦果呈新月形。(2)寬柱唐松草,發現自甘肅南部,其特征為心皮花柱扁平,近長圓形,腹面無柱頭或柱頭組織,據此特征可與此屬中國其他種區別。(3)六脈萼唐松草,發現自四川中部,與白莖唐松草近緣,區別為其莖和小葉有毛,萼片具六條脈,一些雄蕊的花藥敗育,子房被短柔毛,柱頭無翅。(4)吉隆唐松草,發現自西藏南部,與白莖唐松草甚為近緣,區別為小托葉卵形、急尖,復單歧聚傘花序一條頂生,無側生者,雄蕊花藥呈狹長圓形,頂端鈍,無短尖頭。(5)螺柱唐松草,發現自云南西北部,可能與白莖唐松草有親緣關系,區別為其萼片具1條脈,花有4~5枚雄蕊,心皮花柱頂部螺旋狀彎曲,柱頭不明顯。(6)札達唐松草,發現自西藏西南部,與多葉唐松草近緣,區別為其小葉頂端急尖,邊緣具尖牙齒,聚傘圓錐花序具少數分枝和少數花,萼片狹卵形,花藥狹長圓形。

關鍵詞: 毛茛科, 唐松草屬, 新種, 中國

中圖分類號: Q949.746.5

文獻標識碼: A

文章編號: 10003142(2017)06067510

Abstract: Six species of the genus Thalictum (Ranunculaceae) are described as new from China: (1) Thalictrum daguanense, described from northeastern Yunnan Province, is closely related to T. ramosum Boivin, differing from the latter in its thicker, larger and mostly ovate leaflets, shorter and slightly recurved carpel styles, and lunate achene. (2) T. latistylum, described from southern Gansu Province, is charcterized by its flattend suboblong carpel style adaxially without stigma or any stigmatic tissue, and by this unique character can be distinguished from other chinese species of Thalictrum. (3) T. sexnervisepalum, described from central Sichuan Province, is related to T. leuconotum Franch., differing from the latter in its hairy stem and laeflets, 6nerved sepals, some stamens with abortive anthers, puberulous ovariies, and not winged stigmas. (4) T. jilongense, described from southern Xizang Zizhiqu, is closely related to T. leuconotum Franch., differing from the latter in its ovate, acute stipels, thyrses without lateral compound monochasia, and narrowly oblong and not mucronate anthers. (5) T. spiristylum, described from northwestern Yunnan Provice,is probably related to T. leuconotum Franch., differing from the latter in its 1nerved sepals, 45staminate flower, spiraly curved style apex, and inconspicuous stigma. (6) T. zhadaense, described from southwestern Xizang Zizhiqu, is related to T. foliolosum DC., differing from the latter in its acute and acutely dentate leaflets, fewbranched and fewflowered thyreses, narrowovate sepals and narrowoblong anthers.

Key words: Ranunculaceae, Thalictrum, new species, China

1. 大關唐松草圖1

Thalictrum daguanense W. T. Wang, sp. nov.Fig.1.

Ob herbam totam glabram, monochasium compositum pauciflorum corymbiforme, flores parvos, staminum filamentorum partes superas quam has inferas latiores, antheras oblongasspecies nova haec est arcte affinis T. ramoso Boivin, a quo foliolis crasssioribus papyraceis leviter majoribus usque ad 2.8 cm longis et 2.6 cm latis plerumque ovatis vel late ovatis, carpellorum stylis brevioribus 0.5 mm longis apice leviter recurvis haud circinnatis et acheniis lunatis differt.

In T. ramoso, foliola membranacea minora usque ad 2 cm longa et 1.5 cm lata plerumque orbiculariovata, carpellorum styli 0.8 mm longi apeice circinnati, et achenia anguste lanceolata sunt.

Perennial herb, with terrestial vegetative and reproductive organs all glabrous. Stem ca. 30 cm tall, near base 1.5 mm in diam., with 3 cauline leaves. Basal leaves withered at anthesis, not seen. Cauline leaves 2ternate, long petiolate; blades 7-15 × 6-11 cm; leaflets papery, broadly ovate, ovate, or elliptic, 1.2-2.8 × 0.5-2.6 cm, at apex slightly acute, at base rounded, subtruncate or subcordate, 3lobed, with usually central lobes obtusely 2(3)dentate and lateral lobes 1denticulate or entire, 5nerved, with nerves adaxially flat and abaxially prominent and with nervules froming conspicuous nervous nets; petiolules slender, 0.1-2.1 cm long; petioles 5.2-13.5 cm long. Compound monochasium terminal, corymbiform, ca. 2.5 × 2 cm, 6flowered; bracts often caducous, subulate, ca. 4 mm long; pedicels 0.8-1.1 cm long. Flower: Sepals caducous, not seen. Stamens ca. 28, 5-6 mm long; filaments 4-5 mm long, above linear, 0.2-0.35 mm broad, below filiform, ca. 0.1 mm across; anthers oblong, 0.8-1 × 0.3-0.5 mm, apex obtuse. Carpels 7-11, ca. 2 mm long; ovary obliquely and narrowly obovate, ca. 1.5 × 0.5 mm; style 0.5 mm long, apex slightly recurved, adaxially with an inconspicuous stigma. Young achenes lunate, ca. 1.5 × 0.5 mm, on each side longitudinally 3ribbed; persistent style 0.3 mm long.

云南省 (Yunnan Provine): 大關縣,聯合村,罩子溝 (Daguan Xian, Lianhe Cun, Zhaozigou), alt. 1 800 m,山溝森林或灌叢;植物常見;花白色或淡紫色,花蕾紫色 (under forest or bush in valley; plants locally common; fls. white or tinged with purplish, and flower buds purple), 19730617,孫必興 (B. X. Sun) 644 (holotype, PE)。

本種的所有地上營養和生殖器官均無毛,復單歧聚傘花序具少數花,傘房花序狀,花小,雄蕊花絲的上部比下部寬,花藥長圓形,因此,與也具上述特征的多枝唐松草(Thalictrum ramosum Boivin)有很近的親緣關系,與后者的區別在于本種的小葉在質地上較厚,紙質,比較大,長達2.8 cm,寬達2.6 cm,多呈卵形或寬卵形,心皮花柱較短,長0.5 mm,頂端稍向后彎曲,不拳卷,瘦果呈新月形。在多枝唐松草,小葉膜質,較小,長達2 cm,寬達1.5 cm,多呈卵圓形,心皮花柱長0.8 mm,頂端拳卷,瘦果呈狹披針形(王文采和王蜀秀, 1979)。

2. 寬柱唐松草圖2

Thalictrum latistylum W. T. Wang, sp. nov. Fig. 2

Species nova haec carpelli stylo applanato suboblongo ventro stigmate vel textura stigmatica carente insignis est, et cum characteri unico hoc a generis Thalictri speciebus sinensibus ceteris distinguitur. In generis Thalictri speciebus sinensibus ceteris, carpelli stylus vulgo graciliter subulatoteres et ventro stigmate vel textura stigmata praeditus est.

Prennial herbs. Stems ca. 50 cm tall, near base ca. 4 mm in diam., glabrous, below longitudinally shallowly 6sulcate, above branched. Basal and lower cauline leaves withered during anthesis. Middle and upper cauline leaves 23ternate, shortly petiolate; blades 2-7 × 4-10 cm; leaflets thinly papery, broadly obovate, suborbicular, orbroadly ovate, 0.4-1.6 × 0.4-2 cm, at base rounded or subcordate, obtusely 3lobed or 3fid, with lobes at apex obtuse or rounded,entire or obtusely 12dentate, rarely 3lobulate, adaxially glabrous, abaxially glandularpuberulous (hairs 0.1-0.2 mm long), 35nerved, with nerves adaxially flat and abaxially slightly prominent; petiolules filiform, 2-4 mm long, glabrous; petioles 0.3-2 cm long, glabrous or puberulous (hairs ca. 0.2 mm long). Compound monochasia terminal, 3.5-4.5 cm long, 46flowered; bracts foliaceous, ternate, 0.5-3 cm long; pedicels slender, 0.2-1.5 cm long, glabrous. Flower: Sepals 4, white, oblongelliptic, ca. 4 × 2 mm, glabrous, longitudinally 3nerved, apex rounded.

Stamens 35-50, glabrous; filaments narrowly linear, 2.5-3 mm long, above 0.2-0.25 mm broad, below ca. 0.15 mm broad; anthers yellowish, oblong, 0.8-1 × 0.4 mm, apexobtuse. Carpels 4, glabrous; ovary obliquely narrowly obovate, ca. 1 × 0.5 mm, above with style longitudinally 1nerved; style flattened, suboblong, ca. 0.8 × 0.35 mm, apex obtuse; stigma wanting.

甘肅省(Gansu Province):文縣,白水江自然保護區,邱家壩(Wen Xian, Baishuijiang Nature Reserve, Qiujiaba), alt. 2 900 m, 山頂山坡草叢, 花白色(among grasses on slope of mount summit, fls. white), 20060627, 白水江考察隊(Baishuijiang Exped.) 0454 (holotype, PE)。

本種的特征是心皮的花柱扁平,近長圓形,在腹面無柱頭或柱頭組織,根據此一特征可與我國唐松草屬的其他種相區別。在我國此屬的其他種,心皮的花柱呈細鉆狀圓柱形,在其腹面生出柱頭或柱頭組織(王文采和王蜀秀, 1979)。

3. 六脈萼唐松草 圖3

Thalictrum sexnervisepalum W. T. Wang, sp. nov. Fig. 3.

Species nova haec. est affinis T. leuconoto Franch., a quo caulibus prope nodos sparse puberulis, foliolis subtus granuliferis et ad nervos hirtellis, sepalis 6nervibus, staminibus aliquibus antheras abortivas gerentibus et in staminodia mutatis, ovariis minute puberulis et stigmatibus haud alatis differt. In T. leuconoto, caules cum foliis glabri, folia haud granulifera, sepala 3nervia, stamina omnia antheris fertilibus praedita, ovaria glabra, et stigmata utrinque anguste alata sunt.

Perennial herbs. Stems ca. 1 m tall, near base ca. 5 mm in diam., near nodes with sparse short hairs ca. 0.1 mm long, elsewhere glabrous, above branched. Lower cauline leaves withered during anthesis. Upper cauline leaves 3ternatepinnate, shortly petiolate; blades 7-15 × 7-15 cm; leaflets papery, broadly ovate, ovate, obovate or broadly elliptic, 0.6-1.6 × 0.5-1.4 cm, at apex slightly acute or rounded, at base rounded or subcordate, 3lobed, with lobes 12dentate or entire, adaxially glabrous, abaxially with white, small granules 0.1-0.12 mm in diam, and on nerves hirtellous (hairs short, thick, hyaline, 0.2-0.4 mm long), 35nerved, with nerves adaxially flat or slithtly impressed and abaxially prominent; petiolules filiform, 0.05-1.5 cm long, glabrous; petioles 0.5-1 cm long, glabrous, base narrowly vaginate. Compound monochasia terminal, those borne on stem apex ca. 15 cm long, racemelike, sparsely 10flowered, those borne on branch apex 2.5-5 cm long, 34flowered; rachis with pedicels glabrous; bracts foliaceous; pedicels filiform, 6-10 mm long. Flower: Sepals 4(?), white, membranous, broadly elliptic, ca. 3 × 2 mm, glabrous, longitudinally 6purplenerved, apex obtuse. Stamens 12-32, glabrous, of them some being staminodia, bearing abortive anthers; filaments narrowly linear, 2.8-4.2 mm long, above 0.1-0.2 mm broad, below 0.05-0.1 mm broad; anthers of fertile stamens sublinear or narrowly oblong, 0.8-1 × 0.2 mm, apex obtuse, those of staminodia sublinear or narrowly lunulate, 0.4-1 × 0.1-0.15 mm, apex obtuse or acute. Carples 8-10, ca. 3 mm long; ovary narrowly obovate, ca. 1.5 × 0.5 mm, minutely puberulous (hairs 0.05-0.1 mm long), base with a stipe ca. 0.5 mm long; style ca. 1.5 mm long; stigma narrowly oblong, ca. 0.8 mm long, with dense stigmatic tissue.

四川省(Sichuan Province):崇州市,鞍子河自然保護區,雞冠山 (Chongzhou Shi, Anzihe Nature Reserve, Jiguan Shan), alt. 3 100 m, 草叢,植株高0.8~1 m,花白色 (plants growing among grasses, 0.8-1 mm tall, fls. white),20070729,馮正波,朱大海,李小杰 (Z. B. Feng, D. H. Zhu & X. J. Li) 4214 (holotype, PE)。

本種在親緣關系方面接近白莖唐松草 (Thalictrum leuconotum Franch.), 區別在于本種的莖近節處有稀疏短柔毛,小葉背面有小顆粒,并在脈上被透明短粗毛,萼片有6條縱脈,在雄蕊中有一些為退化雄蕊,具退化的花藥,子房被極短柔毛,柱頭無翅。在白莖唐松草,莖和葉均無毛,小葉背面無顆粒,萼片有3條縱脈,全部雄蕊的花藥均能育,子房無毛,柱頭在兩側各有一條狹翅(王文采和王蜀秀, 1979)。

4. 吉隆唐松草圖4

Thalictrum jilongense W. T. Wang, sp. nov.Fig. 4.

Species nova haec est arcte affinis T. leuconoto Franch., a quo stipellis ovatis apice acutis, monochasiis compositis lateralibus absentibus, antheris anguste oblongis apice obtusis haud mucroantis recedit. In T. leuconoto, stipella orbitulariovata apice rotundata , monochasia composita lateralia 3-5 cum monochasio composito terminali thyrsum terminalem formantia, antherae oblongae apice conspicue mucronatae sunt.

Perennial herbs, totally glabrous. Stems ca. 60 cm tall, near base ca. 2.5 mm in diam., simple, ca. 5leaved. Basal and lowermost cauline leaves withered during anthesis, other cauline leaves 3ternatepinnate, long or shortly petiolate; blades broadly triangular, up to

5.8 × 14 cm; leaflets papery, broadly obovate or suborbicular, 0.4-1.3 × 0.3-0.9 cm, at apex rounded, at base rounded, broadly cuneate or subcordate, 23lobed or 23fid, with lobes at apex rounded or obruse, mostly entire, rarely obtusely 12denticulate, 3nerved, with nerves on both surfaces flat, and with conspicuous nervous nets; petiolules wangting or present, 1-3 mm long; stipels opposite, white, membranous, ovate, 2-3 × 1-1.8 mm, apex acute; petioles 0.5-6.5 cm long. Compound monochasium terminal, ca. 4 cm long, racemelike, densely 10flowered, lateral compound monochasia wanting; bracts foliaceous, 1-3 cm long; pedicels filiform, 3-7 mm long. Flower: Sepals 4, white, broadly elliptic, ca. 2.8 × 2 mm, inconspicuously longitudinally 3nerved, apex rounded. Stamens 7-10; filaments filiform, ca. 3 mm long; anthers yellow, narrowly oblong, ca. 2 × 0.4 mm, apex obtuse. Carpels 3-4; ovary narrowly obovate or long elliptic, 2 × 0.5-0.6 mm; style 1 mm long; stigma narrowly oblong, ca. 0.8 × 0.35 mm, on each side with a narrow wing.

西藏自治區(Xizang Zizhiqu):吉隆縣,汝戈喇嘛廟山上 (Jilong Xian, on mountain behind the Ruge Temple), alt. 3 600 m,林下,花白色 (plants being under forest, with white flowers), 19720617, 西藏中草藥隊 (Xizang Med. Pl. Exped.) 309 (holotype, PE)。

本種在親緣關系方面與白莖唐松草(Thalictrum leuconotum Franch.)甚為接近,區別在于本種的小托葉卵形,頂端急尖,無側生的復單歧聚傘花序(花序只具1條頂生似總狀花序的復單歧聚傘花序),雄蕊花藥呈長圓形,頂端鈍,無短尖頭。在白莖唐松草,小托葉圓卵形,頂端圓形,頂生聚傘圓錐花序由3~5條側生復單歧聚傘花序和1條頂生復單歧聚傘花序組成,雄蕊花藥呈長圓形,頂端具明顯短尖頭。

5. 螺柱唐松草圖5

Thalictrum spiristylum W. T. Wang, sp. nov. Fig. 5

Ob monohasia composita racemis similia et staminum filamenta filiformia species nova haec est fortasse affinis T. leuconoto Franch., a quo sepalis 1nervibus, flore stamina 4-5 tantum gerente, carpellorum stylis prope apicem spiraliter curvatis, stigmatibus inconspicuis haud alatis praeclare differt. In T. leuconoto, sepala 3nervia, flos staminibus 8-16 praeditus, carpellorum styli recti, et stigmata conspicua anguste oblonga utrinque anguste 1alata sunt.

Perennial herbs. Stems ca. 60 cm tall, subglabrous, branched. Middle and upper cauline leaves 23ternatepinnate, glabrous, shortly petiolate; blades 10-15 × 10-18 cm; leaflets thinly papery, broadly rhombic, obovate, broadly obovate or broadly ovate, 1-3.5 × 0.7-3.6 cm, at base rounded, broadly cuneate or subtruncate, 3lobed or 3fid, with lobes acute at apex, acutely 12dentate or entire, 35nerved, with nerves on both surfaces flat; petiolules filiform, 0.1-2 cm long; petioles 0.3-3.5 cm long, at base vaginate. Terminal compound monochasium ca. 4 cm long, densely ca. 15flowered, and lateral compound monochasia ca. 3, 3.5-8.5 cm long, ca. 10flowered, at base with a short brach 14flowered, subglabrous, all compound monochasia racemelike; bracts foli

aceous, with only petioles very sparsely puberulous, elsewhere glabrous; pedicels robust, ca. 1 mm long, glabrous. Flower glabrous: Sepals 4, whitish, oblongovate, ca. 2.2-0.8 mm, longitudinally 1nerved, apex slightly acute. Stamens 5-6; filaments filiform, 1.5-3 mm long; anthers oblong or narrowly oblong, 0.8 × 0.3-0.45 mm, apex minutely mucronate (mucrones ca. 0.1 mm long), or not mucronate, slightly acute. Carpels 4-5; ovary oblongelliptic, 2 × 0.6-0.7 mm; style ca. 2 mm long, near apex spirally curved, adaxially below with an inconspicuous stigma.

云南省(Yunnan Province):寧蒗縣,寧蒗林業局,水草壩 (Ninglang Xian, Ninglang Forestry Bureau, Shuicaoba), alt. 3 100 m, 溝谷坡地,草本植物高0.6 m (on slope in valley, herbs 0.6 m tall),19810710,韓裕豐,鄧坤梅,陳永瑞 (Y. F. Han, K. M. Deng & Y. R. Chen) 811070 (holotype, PE)。

本種的復單歧聚傘花序與總狀花序相似,雄蕊花絲呈絲形,因此可能與也具上述特征的白莖唐松草(Thalictrum leuconotum Franch.)有親緣關系,與后者的區別在于本種的萼片具1條脈,每朵花只具4~5枚雄蕊,心皮花柱近頂端螺旋狀彎曲,柱頭不明顯,無翅。在白莖唐松草,萼片具3條脈,每朵花具8~16枚雄蕊,花柱直,柱頭明顯,狹長圓形,每側各有1條狹翅(王文采和王蜀秀,1979)。

6. 札達唐松草圖6

Thalictrum zhadaense W. T. Wang, sp. nov.Fig. 6

Species nova est affinis T. folioloso DC., a quo foliolis apice acutis margine acute dentatis, thyrsis sparse ramosis flores pauciores laxos gerentibus, sepalis anguste ovatis apice attenuatis, antheris anguste oblongis differt. In T. folioloso, foliola apice rotundata margine obtuse dentata, thyrsi multo ramosi flores multos densos gerentes, sepala suboblonga apice rotundata, et antherae lineares sunt.

Perennial herbs, totally glabrous. Stems ca. 90 cm tall, near the middle ca. 4 mm in diam., Upper cauline leaves 3ternatepinnate, shortly petiolate; blades, triangular, ca. 20 × 12 cm; leaflets papery, broadly obovate, obovate, broadly elliptic or subquadrate, 1-1.8 × 0.7-1.5 cm, at apex acute, at base rounded or truncate, 3lobed or 3fid, with acute lobes acutely 12dentate or entire, 35nerved, with nerves adaxially flat and abaxially inconspicuously slightly prominent; petiolules filiform, 0.2-2.2 cm long; petioles ca. 1.5 cm long, at base narrowly vaginate. Thyrse termional, ca. 50 cm long, its branches ca. 6, 7-15 cm long, sparsely 38flowered; bracts foliaceous; pedicels filiform, 0.4-1.5 cm long. Flower: Sepals 4, narrowly ovate, 5-5.6 × 2.2-2.8 mm, longitudinally 3purplishnerved, apex attenuate. Stamens 14-20; filaments filiform, 2-2.5 mm long; anthers yellow, narrowly oblong, 1.8-2.8 × 0.4-0.6 mm, apex mucronate, with mucrones 0.1-0.2 mm long. Carpels 6-7; ovary obliquely elliptic, ca. 1 × 0.55 mm, on each side inconspicuously longitudinaly 3ribbed; style ca. 0.7 mm long; stigma narrowly lanceolateoblong, ca. 0.6 × 0.3 mm, at each side with a narrow wing.

西藏自治區 (Xizhang Zizhiqu):札達縣,馬陽村 (Zhada Xian, Mayang Cun), alt. 3 500 m,河灘 (on river bank), 19760320,青藏隊 (QinghaiXizhang Exped.) 12911 (holotype, PE)。

本種與多葉唐松草(Thalictrum foliolosum DC.)在親緣關系上相近,區別在于本種的小葉頂端急尖,在邊緣具尖牙齒,聚傘圓錐花序具少數分枝和較少并稀疏的花,萼片呈狹卵形,頂端漸狹,雄蕊花藥呈狹長圓形。在多葉唐松草,小葉頂端圓形,邊緣具鈍牙齒,聚傘圓錐花序多次分枝,具多數密集的花,萼片近長圓形,頂端圓形,雄蕊花藥呈條形 (王文采和王蜀秀,1979)。

致謝深切感謝孫英寶先生為本文繪制十分精致的插圖。

參考文獻:

WANG WT, WANG SH, 1979. Thalictum. Flora Reipubicae Popularis Sinicae. Beijing: Science Press, 27: 502-592.[王文采,王蜀秀, 1979. 唐松草屬. 中國植物志. 北京:科學出版社, 27: 502-592.]

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