狭裂乌头 xia lie wu tou

Aconitum napellus Linnaeus var. refractum Finet & Gagnepain, Bull. Soc. Bot. France 51: 513. 1904; A. angustisegmentum W. T. Wang.

Caudex unknown. Stem ca. 1.5 m, many branched below inflorescence, glabrous or apically sparsely retrorse pubescent, with leaves equally arranged along stem. Middle cauline leaves slightly long petiolate; petiole ca. 3 cm, sparsely retrorse pubescent; leaf blade pentagonal, ca. 10 × 14 cm, abaxially glabrous, adaxially sparsely appressed pubescent, base shallowly cordate, 3-sect or -parted nearly to 2.5 mm from base; central segment narrowly ovate-rhombic or narrowly rhombic, margin 2--4-dentate; lateral segments unequally 2-parted nearly to base. Inflorescence terminal, to 55 cm, many flowered; rachis and pedicels densely retrorse and appressed pubescent; proximal bracts leaflike, distal ones linear or narrowly linear. Pedicels 1.2--5 cm, oblique upward, apex slightly curved, with 2 bracteoles below middle or nearly to base; bracteoles linear-subulate, 2.5--3 mm. Sepals blue, abaxially sparsely pubescent; lower sepals ca. 1 cm; lateral sepals 1.2--1.5 cm; upper sepal navicular, 1.2--1.6 cm high, 1.3--1.6 cm from base to beak, lower margin oblique upward, curved. Petals pubescent above; lip ca. 4 mm, slightly concave; spur incurved, ca. 1 mm. Stamens glabrous; filaments entire. Carpels 3, glabrous or pubescent. Fl. Sep.

* Grassy slopes. W Sichuan, E Xizang (Qamdo Xian).

After publication of the treatment for the FOC, this taxon was lectotypified by LUO Yan & YANG Qiner (Acta Phytotax. Sin. 43 (4): 372-375. 2005).