Cremanthodium maoxianense L. Wang, C. Ren & Q.E. Yang, 2018
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publication ID |
https://doi.org/ 10.11646/phytotaxa.360.3.2 |
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persistent identifier |
https://treatment.plazi.org/id/4246E710-FF9A-FF98-FF40-FE5FFEA6FDA9 |
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Felipe |
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scientific name |
Cremanthodium maoxianense L. Wang, C. Ren & Q.E. Yang |
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2. Cremanthodium maoxianense L. Wang, C. Ren & Q.E. Yang View in CoL , sp. nov. Figs. 9–11.
Type:— CHINA. Sichuan: Maoxian, Nanxin , Jiuding Shan , Heilongtan , 31°29 ʹ 23.08 ʺ N, 103°45 ʹ 51.30 ʺ E, gravelly grassy slope beside an alpine lake, 3800 m, 19 July 2017, L. Wang & Y. Y. Shao 1480 (holotype IBSC; isotypes CDBI, PE) GoogleMaps .
Perennial herbs, 8–20 cm tall. Stems solitary, erect, 2–4 mm in diameter at base, densely brown pilose distally. Basal leaves subsessile or shortly petiolate; petiole to 1.5 cm long, yellow puberulent; leaf blade thick, oblong to ovatecordate, 5–10 cm long, 2–5 cm wide, adaxially bright green, glabrous, abaxially pale green, yellow puberulent, especially so along the veins, base cordate, truncate to cuneate, margin entire or shallowly crenate, yellow puberulent, apex obtuse or rounded; pinnate veins slightly sunken adaxially, prominent abaxially. Stem leaves 6–14, sessile, 1–2 cm long, mutually closely adjacent with a distance of 1.5–1.7 cm between each other, lanceolate to linear, base not amplexicaul. Capitula solitary, nodding. Involucre hemispheric, 1–1.8 cm high, 2–3 cm in diameter, outside densely brown puberulent, sometimes slightly white arachnoid; phyllaries 13–18, in 2 rows; outer phyllaries lanceolate or narrowly oblong, 3 mm wide, apex narrowly acute, inner ones oblong, 4 mm wide, margin membranous, shortly white ciliate on upper edges, apex acute. Ray florets yellow, 13–19; lamina narrowly lanceolate or elliptic, 2–2.3 cm long, ca. 0.6 cm wide, apex acute, shallowly 3-denticulate; tube ca. 1 mm long. Tubular florets numerous, yellow, 8 mm long; tube ca. 2 mm long; limb ca. 5 mm long; style 8 mm long; style branches yellow. Achenes obovoid, ca. 2 mm long. Pappus white, 6 mm long, as long as tubular corolla.
Distribution and habitat:— Cremanthodium maoxianense is currently known only from its type locality, i.e. Maoxian in western Sichuan, China ( Fig. 12 View FIGURE 12 ). It grows in gravelly grassy places on mountains at an altitude of ca. 3800 m above sea level.
Phenology:—Flowering from July to August; fruiting in September.
Etymology:—The specific epithet is derived from Maoxian in western Sichuan, China, the type locality of the new species.
Additional specimens examined (paratypes):— CHINA. Sichuan: Maoxian, Nanxin, Jiuding Shan, Heilongtan, 31°29 ʹ 23.08 ʺ N, 103°45 ʹ 51.30 ʺ E, gravelly grassy slope beside an alpine lake, 3800 m, 21 July 2017, T.J. Tong & M. Tang 166 (IBSC).
Discussion:— Cremanthodium maoxianense is most closely similar to C. nobile ( Franchet 1892: 287) Diels ex Léveillé (1915: 43) ( Figs. 13 View FIGURE 13 , 14 View FIGURE 14 ) and C. pilosum Liu (1988: 29) ( Figs. 15 View FIGURE 15 , 16 View FIGURE 16 ) in general aspect, but differs from the latter two species by the stem densely brown pilose (vs. densely purplish black pilose, sometimes white arachnoid), the stem leaves 6–14 (vs. 2–5 (–7)) which are mutually 1.5–1.7 cm (vs. 4.2–7.5 cm) distant, and the pappus ca. 6 mm (vs. absent, if present, 3.5–4 mm) long. From C. nobile it is also readily distinguishable by the basal leaves glabrous adaxially and yet yellow puberulent abaxially (vs. glabrous on both surfaces), and from C. pilosum it is distinct by the basal leaves yellow puberulent adaxially only (vs. on both surfaces). In habit C. maoxianense is also similar to C. variifolium Good (1929: 298 ; Fig. 17 View FIGURE 17 ), but can be distinguished by the stem densely brown pilose distally (vs. brown pilose and white arachnoid), the basal leaves yellow puberulent abaxially, especially so along the veins (vs. glabrous), the involucres densely brown puberulent outside, sometimes slightly white arachnoid (vs. glabrous, glabrescent or slightly black puberulent) and the ray laminae narrowly lanceolate or elliptic (vs. oblong to narrowly oblanceolate), apex acute (vs. obtuse or truncate), shallowly 3-denticulate (vs. markedly 3-dentate). A morphological comparison of C. maoxianense , C. nobile , C. pilosum and C. variifolium is given in Table 2. Geographically, C. nobile is widely distributed in southwestern Sichuan (Daocheng, Jiulong, Litang, Mianning, Muli, Yanyuan) and northwestern Yunnan (Eryuan, Heqing, Jianchuan, Ninglang, Shangri-la, Yulong), and C. variifolium occurs in southeastern Xizang (Zayü) and northwestern Yunnan (Dêqên, Gongshan, Weixi) in China and also in northeastern Myanmar, while C. pilosum and C. maoxianense are currently known only from southwestern Sichuan (Muli) and western Sichuan (Maoxian), respectively.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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