Cylindrolobus glabriflorus X.H.Jin & J.D.Ya, 2019

Ya, Ji-Dong, Jin, Xiao-Hua & Liu, Cheng, 2019, Two new species of Cylindrolobus (Orchidaceae) from the eastern Himalayas, PhytoKeys 130, pp. 107-113 : 107

Cylindrolobus glabriflorus X.H.Jin & J.D.Ya sp. nov. Figures 2 , 3B

Diagnosis.

Cylindrolobus glabriflorus is similar to C. hegdei (Agrawala & H. J. Chowdhery) A. N. Rao and C. tenuicaulis (S. C. Chen & Z. H. Tsi) S. C. Chen & J. J. Wood ( Agrawala and Chowdhery 2008, Chen et al. 2009). The new species can be distinguished from C. hegdei by the longer and wider leaves, glabrous inflorescence, smaller and yellow flowers, yellowish green and obovate bracts and reddish brown central papillate keel of lip. It differs from C. tenuicaulis by having longer and wider leaves, longer inflorescence, yellowish green and obovate bracts, longer lip with three calli, lateral margins of mid-lobe thickened and erect.

Type.

MYANMAR. Kachin State: Putao Township, Hponkanrazi Wildlife Sanctuary, subtropical, evergreen, broad-leaved, humid montane forest, alt. 2200 m, 12 Apr 2018, Xiao-Hua Jin, Ji-Dong Ya 18HT1618 (holotype: KUN!).

Additional specimen examined.

CHINA. Xizang Autonomous Region: Motuo, subtropical, evergreen broad-leaved forest, alt. 1796 m, 2 Apr 2019, Ji-Dong Ya, Cheng Liu, 18HT2586 (paratype: KUN!). CHINA. Xizang Autonomous Region: Motuo, subtropical, evergreen broad-leaved forest, alt. 1750 m, 7 Apr 2018, Hong Jiang, Wei-ping Zhang, Zhou-dong Han 07336 (paratype: YAF!).

Description.

Epiphytic herb. Roots terete, slender, pubescent, ca. 0.8-1.0 mm thick. Rhizome inconspicuous. Stem clustered, terete, slender, 4-leaved apically, covered by close-fitting sheaths, 13-25 cm long, 3-4 mm thick. Leaves lanceolate, acuminate, 4.5-6.5 cm long, 0.8-1.5 cm wide. Inflorescences axillary, glabrous, arising from the apical of the stem, 1.3 cm long, 2-flowered; peduncle 0.5 cm long; sterile bracts 1-2, smaller. Flowers yellow, sepal externally reddish yellow, 7-8mm long; floral bracts yellowish green with red brown edges, obovate, mucronate, concave, glabrous, 4 mm long, 2.5 mm wide; peduncle and ovary ca. 4-6 mm long. Dorsal sepal lanceolate, obtuse, 3 veined, 6 mm long, 2 mm wide; lateral sepals falcate-ovate, obtuse, 3-veined, 5 mm long, 3.5 mm wide, base adnate to column foot form a subglobose and obtuse mentum; petals oblong-ovate, slightly oblique at base, obtuse, 1 veined, 5 mm long, 2 mm wide; labellum oblong in outline, 3-lobed, base hinged to the apex of the column foot, apex emarginate, ca.3.5 mm long, 1.5 mm wide; lateral lobes suberect, subovate, apex slightly introvert, disk with 2 reddish brown calli; mid-lobe sub-square, ca. 3.3 mm × 2 mm, lateral margins thickened and erect, with a central papillate keel, reddish brown, ca. 0.5 mm high; apex emarginate. Column semiterete, ca. 3.5 mm long, narrow winged at ventrally; rostellum triangle, 0.2 mm, a hook-like protrusion under the stigma; foot incurved, ca. 4 mm; cap subrotund, ca. 0.6 mm × 0.6 mm, papillate and protrude in front; pollinia 8, yellowish white, compressed subrotund from the lateral view, anterior 4 ca. 0.2 mm × 0.2mm × 0.1mm, posterior 4 smaller. Fl. April-May.

Etymology.

The specific epithet " glabriflorus " refers to glabrous flowers of this new species.

Vernacular name.

Zhong Mian Zhu Lan (中缅柱兰).

Figures

Figure 2. Cylindrolobus glabriflorus X. H. Jin & J. D. Ya. A Plant B inflorescence C ventral view of flower D lateral view of flower E adaxial sepals and petals F abaxial sepals and petals G lateral view of column and lip H front view of labellum I lateral view of labellum J ventral view of labellum K lateral view of column L front view of column M adaxial bract N abaxial bract O lateral view of pollinarium P polar view of pollinarium Q abaxial anther cap R adaxial anther cap (Photographed by J. D. Ya).

Figure 3. Holotype. A Cylindrolobus motuoensis X. H. Jin & J. D. Ya. B Cylindrolobus glabriflorus X. H. Jin & J. D. Ya.