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SCBG Checklist | Family List | Asteraceae | Youngia

Youngia heterophylla (Hemsl.) Babc. et Stebb.

异叶黄鹌菜

Description from Flora of China

Crepis heterophylla Hemsley, J. Linn. Soc., Bot. 23: 475. 1888; C. bockiana Diels.

Herbs 30-110 cm tall, annual to ?perennial. Stems solitary or few, erect, branched usually in apical third, glabrous or sparsely hairy. Basal and lower stem leaves oblanceolate, to 32 × 11 cm, lyrately pinnatipartite or sometimes undivided, both faces glabrous or ± pubescent with short hairs, base attenuate into a ± unwinged very variable in length (much longer when leaf undivided) petiole-like portion, margin sinuate-dentate; lateral lobes 1-8 pairs, opposite to obliquely opposite, elliptic to ovate, base truncate to attenuate and sometimes petiolulate, apex acute, obtuse, or rounded; terminal lobe elliptic, ovate, or lanceolate, much larger than lateral lobes, apex ± acute. Middle stem leaves similar to lower leaves but smaller and less (or more rarely not) divided, terminal lobe long acuminate; upper stem leaves narrowly elliptic, lanceolate, or linear-lanceolate, reduced in size. Synflorescence paniculiform-corymbiform, with many capitula. Capitula with 11-25 florets; peduncle capillaceous, usually 0.5-2 cm. Involucre cylindric, 6-7.5 mm. Phyllaries abaxially glabrous; outer phyllaries ovate, longest to 1(-2) mm, apex acute; inner phyllaries ca. 8, adaxially appressed pubescent, midvein subapically plane, margin narrowly white scarious, apex acute. Anther tube green. Style branches yellow upon drying. Achene dark brownish purple, fusiform, 2-3 mm, ribs apically finely spiculate, apex attenuate. Pappus white, 3-4 mm. Fl. and fr. Apr-Oct.

Crepis? bockiana Diels (Bot. Jahrb. Syst. 29: 633. 1901) is based on the collection from Nanchuan, Chongqing, Bock & von Rosthorn 1593, which according to Babcock (Univ. Calif. Publ. Bot. 22: 916. 1947), who investigated a corresponding sheet from B, is a mixed gathering of a fragment with leaves and buds of Youngia heterophylla and a second completely sterile fragment with a single leaf of an unknown species. The sheet at B was apparently destroyed in 1943 and no other material of this collection is present at O, where the original set of the Bock and Rosthorn material is preserved. Therefore, the name is here treated as a synonym of Y. heterophylla. See also note under Y. rosthornii.

Youngia heterophylla may be confused with leafy-stemmed forms of Y. japonica subsp. longiflora. The latter, however, is strictly annual, its stem leaves have rather triangular or rhombic lateral lobes and an acute or shortly acuminate terminal lobe, and the pappus is of a single series of bristles only (vs. several bristles in a second series in Y. heterophylla).

● Forests, forest margins, wastelands; 400-2300 m. Chongqing, Gansu, Guangdong, Guangxi, ?Guizhou, Hubei, Hunan, Jiangxi, Shaanxi, Sichuan, Yunnan.

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