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FOC | Family List | FOC Vol. 6 | Ranunculaceae | Aconitum

38. Aconitum nagarum Stapf, Ann. Roy. Bot. Gard. (Calcutta). 10: 176. 1905.

保山乌头 bao shan wu tou

Caudex subterete or carrot-shaped. Stem 50--70(--100) cm tall, simple or branched, basally becoming glabrous, apically sparsely curved and appressed pubescent. Basal leaves and subbasal cauline leaves long petiolate; petiole to 48 cm, nearly glabrous, base shortly sheathed; leaf blade pentagonal-reniform, 5--8.5 × 10--15 cm, papery or leathery, abaxially sparsely appressed pubescent, adaxially nearly glabrous, 3-sect, sometimes nearly to base; central segment rhombic or obovate-rhombic, 3-fid, ultimate lobes narrowly ovate or narrowly lanceolate; lateral segment obliquely flabellate, unequally 2-parted. Cauline leaves 1--3, similar to basal ones but smaller. Inflorescence narrowly long, 12--30 cm, 6--25-flowered; proximal bracts leaflike, distal ones narrowly ovate; rachis and pedicels densely curved and appressed white pubescent. Pedicels 2--4.5 cm, proximally with 2 bracteoles; bracteoles narrowly ovate, 3--4 mm. Sepals blue-purple, abaxially white pubescent; lower sepals ca. 1.1 cm; lateral sepals orbicular-obovate, ca. 1.2 cm; upper sepal navicular-galeate, oblique upward, shortly clawed, shortly beaked, ca. 1.8 cm from base to beak, lower margin slightly concave. Petals glabrous; limb ca. 7 mm; lip ca. 2.5 mm; spur incurved, ca. 1.5 mm or ecalcarate. Stamens glabrous; filaments entire. Carpels 5, densely white pubescent. Fl. Oct. 2n = 16*.

Forest margins, scrub, grassy slopes; 1800--3800 m. Yunnan [NE India, N Myanmar].

1 Filaments yellow pubescent distally; caudex carrot-shaped; stem ca. 50 cm tall   38c var. lasiandrum
+ Filaments glabrous; caudex terete; stem 70--100 cm tall.   (2)
2 (1) Rachis and pedicels densely curved and appressed white pubescent; ovary densely white pubescent   38a var. nagarum
+ Rachis and pedicels curved white pubescent and spreading glandular pubescent; ovary densely yellow or yellowish pubescent or glabrous   38b var. heterotrichum


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