中国伞形科植物在线

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Acronema tenerum/丝瓣芹

General description: 

Plants 5–30 cm. Rhizome narrowly conic, or elongate-globose, ca. 5 mm across. Stem solitary, slender. Basal leaves petiolate, petioles 2–5 cm, sheaths narrowly lanceolate; blade triangular, 1.5–2.5 × 1.5–3 cm, 2–3-ternate-pinnate; ultimate segments cuneate-obovate or obovate, ca. 5 × 5 mm, apex often 3-toothed. Umbels 2–3 cm across; peduncles 2–5 cm, slender; bracts usually absent; rays 3–4, 1–2 cm, unequal; bracteoles 1–3, 2–3 mm; umbellules 6–14 mm across, 3–5-flowered; pedi-cels 2–7 mm, unequal. Calyx teeth obsolete. Petals purple-red, ovate, ca. 2 mm; apex linear, ca. 1 mm. Fruit broad-ovoid, ca. 1–1.5 × 1–1.5 mm; vittae minute, 2 in each furrow, 2 on com-missure. Fl. Aug.

Diagnostic description: 

Despite this species being the most widespread in the genus, fruit-ing material is still lacking for many areas (including China). This species is similar and closely related to Acronema hookeri, with which larger specimens of A. tenerum can be confused. The presence of brac-teoles and shorter petal apices are useful in recognizing such specimens of A. tenerum.

Distribution: 

 E Xizang, NW Yunnan [Bhutan, NE India, E Nepal, Sikkim, N Thailand].

Habitat: 

Damp shady crevices; 3400–3500 m.

周日, 2014-08-31 14:07 -- admin
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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith