Sinoseris

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Sinoseris

Distribution

Asia-Temperate: China South-Central (Sichuan native, Yunnan native)

Description

"Annual (or monocarpic biennial) herbs with leafy stem and conspicuous, stiff indumentum on stem, leaves and involucres, late flowering (Sep – Nov).Basal and lowermost cauline leaves with petiole-like portion as long as or longer than lamina. Capitula 3–12 flowered, in ± secund, subspiciform to narrowly paniculiform paracladia from axils of cauline leaves, pendent in bud, subpendent at anthesis and pendent again at fruiting. Involucre narrowly cylindric at anthesis, strongly differentiated into an equal inner and very inconspicuous outer phyllary series. Receptacle epaleate, glabrous, smooth. Florets with yellow corolla, styles greyish to blackish. Pollen echinolophate, tricolpate, of Cichorium type (sensu Blackmore 1986) with polar areas either triangular, moderately extensive and each with c. 12 spines, or very extensive, approximately hexagonal and each with >20 spines, and with moderately narrow interlacunar gaps. Achenes beaked; corpus somewhat flattened, ± subconic, with 5 main ribs (best discernible near base) alternating with (2 or)3 or 4 secondary ribs (fully developed in middle third and then similar in shape to main ribs), dark brown, with appressed to spreading-erect (in distal portion of corpus) linear, flattened, acute papillae; beak slender, shorter than or as long as corpus. Pappus dirty white to pale brown, caducous, of scabrid bristles similar in length and diameter, with 7–12(–14) rows of cells in cross-section near base."

from Wang & al. (2020: 99–102).A

Etymology

The generic name Sinoseris is a compound of the Latin “Sina” for China and “seris” (σέρις), the classical Greek name for salad (originally of Cichorium species).A

Systematics

Sinoseris is a genus of three species, endemic to the Chinese provinces of Yunnan and Sichuan. They are late flowering (Sep-Nov) annuals (or perhaps monocarpic biennials) of open rocky habitats in the subtropical (warm-temperate) highlands, with a conspicuous indumentum of stiff hairs on stems, leaves and involucres. They are further characterised by distinctly petiolate basal leaves, a synflorescence of secund, subspiciform to paniculiform paracladia, capitula with 3–12 florets, an involucre with inconspicuous outer phyllaries, beaked achenes with 5 main ribs alternating with (2 or)3 or 4 secondary ribs and a dirty white to pale brown pappus of moderately coarse, scabrid bristles (Wang & al. 2020).

Molecular phylogenetics (Wang & al. 2020) resolve the genus as a well supported clade of the Crepidinae (plastid DNA tree, deeper nodes of the subtribe unresolved) or their Dubyaea-Nabalus-Soroseris-Syncalathium polytomy (nrITS tree), respectively.

Only one of its species has been known for a longer time but was treated as a member of the Lactuca alliance and originally described under the names Lactuca hirsuta and L. scandens.A

Bibliography

A. Wang Z. H., Kilian N., Chen Y.-P. & al., Sinoseris (Crepidinae, Cichorieae, Asteraceae), a new genus of three species endemic to China, one of them new to science in Willdenowia 50: 91–110. 2020