Dubyaea

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Dubyaea

Common names

Chinese (China): 厚喙菊属 hou hui ju shuA

Description

Herbs, perennial, often rosulate, caulescent or rarely acaulescent with 1 or few scapes. Stems leafy or leafless, with ± stiff, yellowish brown, reddish to purplish brown, or blackish mostly glandular hairs, rarely glabrous. Synflorescence of a solitary capitulum or corymbiform, rarely umbelliform with few to several or rarely to 20 capitula. Capitula declined, pendent, or erect, with several (ca. 7) to numerous (ca. 70) florets. Involucre cylindric, broadly campanulate, or almost hemispheric. Phyllaries in several series, often dark green to purplish or blackish when dry, glabrous or with brownish, purplish, or blackish stiff often glandular hairs along midvein; outer phyllaries imbricate, centripetally longer, longest 1/3–4/5 as long as inner ones; inner phyllaries ca. 8 to many, linearlanceolate to lanceolate, ± equal to somewhat unequal in length. Florets yellow or of some shade of purple (pale, bluish, reddish, or brownish), or blue. Receptacle naked. Achene ± fusiform, weakly ± compressed, with 5 usually prominent main ribs alternating with 1 or 2 more slender secondary ribs, apex truncate or attenuate. Pappus yellowish, brownish, brown, or rarely ?whitish, bristles scabrid.

from: Shih C. & Kilian N. in Wu Z. Y. & al. (ed.), Flora of China 20–21: 335. 2011, Beijing & St Louis.

Systematics

Dubyaea is a genus of about 15 species, distributed in the E Himalayas (Bhutan, N India, Nepal), SW China and N Myanmar. It is a member of the large E Asian-North American Dubyaea-Nabalus-Soroseris-Syncalathium clade (see Crepidinae, Systematics).

Chromosome numbers

Diploids, x = 8.B

Distribution

Asia-Temperate: China South-Central (Sichuannative, Yunnannative); Tibet (Tibetnative) Asia-Tropical: Assam (Assamnative); East Himalaya (Arunachal Pradeshnative, Bhutannative, Darjilingnative, Sikkimnative); India (Uttar Pradeshnative, West Bengalnative); Myanmar (Myanmarnative); Nepal (Nepalnative); West Himalaya (Himachal Pradeshnative, Jammu-Kashmirnative, Uttaranchalnative)

Bibliography

A. Wu & al., Flora of China 20-21. 2011
B. Watanabe K., Index to chromosome numbers in Asteraceae.