5. Crepidiastrum chelidoniifolium (Makino) Pak & Kawano, Mem. Fac. Sci. Kyoto Univ., Ser. Biol. 15: 56. 1992.
少花假还阳参 shao hua jia huan yang shen
Lactuca chelidoniifolia Makino, Bot. Mag. (Tokyo) 12: 47. 1898 ["chelidonifolia"]; Ixeris chelidoniifolia (Makino) Stebbins; L. senecio H. Léveillé & Vaniot; Paraixeris chelidoniifolia (Makino) Nakai; Youngia chelidoniifolia (Makino) Kitamura.
Herbs 10-25[-50] cm tall, annual, glabrous. Stem solitary, erect, branched from base. Basal leaves withered at anthesis. Lower and middle stem leaves with a slender petiole often basally with well-developed dentate or dissected auricles; leaf blade ± elliptic, 2-6[-12] × 0.5-3[-6] cm, irregularly and interruptedly pinnatisect, rachis wingless; lateral lobes 1-4 pairs, opposite to alternate, ovate, elliptic, falcate, rhombic, or oblanceolate, margin sparsely dentate to incised; terminal lobe similar to lateral ones. Upper stem leaves similar to lower and middle stem leaves. Synflorescence of main stem and branches corymbiform or paniculiform, with few to many capitula. Capitula with ca. 5(or 6) florets. Involucre narrowly cylindric, 5-7 mm. Outer phyllaries few, ovate, longest 0.6-1 mm, apex obtuse to acute; inner phyllaries 5, apex acute to obtuse. Anther tube and style greenish to blackish upon drying. Achene brownish, fusiform, 2.5-3.5 mm, with 10-15 apically long papillose ribs, apex attenuate or with a beak to 0.7 mm. Pappus white, 3.5-4.5 mm. Fl. and fr. Sep-Oct. 2n = 10.
Mountain slopes, ravines, forests, moist cliffs; 1000-1700 m. Heilongjiang, Jilin [Japan, Korea, E Russia].
"Ixeris saxatilis" (Baranov, Zap. Kharbin. Obshch. Estestvoisp. Etnogr. 12: 34. 1954, and repeated identically in Feddes Repert. Spec. Nov. Regni Veg. 63: 289. 1961), based on a collection from Heilongjiang, is here considered as conspecific with Crepidiastrum chelidoniifolium, following Sennikov (Bot. Zhurn. 82(5): 114. 1997). Sennikov also noted (loc. cit.) that the name "I. saxatilis" was not validly published because the alternative name "Lactuca saxatilis" was proposed simultaneously (Vienna Code, Art. 34.2). Three later binomials referring to, and based on, Baranov’s original description, where two gatherings were cited, were also not validly published, because their authors failed to indicate a single gathering as the type (Art. 37.1 and 37.2): "Ixeris saxatilis" (Soják, Novit. Bot. Delect. Seminum Horti Bot. Univ. Carol. Prag. 1962: 50. 1962), "Paraixeris saxatilis" (Tzvelev, Fl. URSS 29: 400. 1964), and "Crepidiastrum saxatile" (Pak & Kawano, Mem. Fac. Sci. Kyoto Univ., Ser. Biol. 15: 57. 1992).