Ticanto yunnanensis (S. J. Li, D. X. Zhang & Z.Y. Chen) R. Clark & Gagnon, 2022

Clark, Ruth P., Jiang, Kai-Wen & Gagnon, Edeline, 2022, Reinstatement of Ticanto (Leguminosae - Caesalpinioideae) - the final piece in the Caesalpinia group puzzle, PhytoKeys 205, pp. 59-98 : 59

9. Ticanto yunnanensis (S. J. Li, D. X. Zhang & Z.Y. Chen) R. Clark & Gagnon comb. nov.

Basionym.

Caesalpinia yunnanensis S. J. Li, D. X. Zhang & Z.Y. Chen. Novon 16(1): 78-80. 2006.

Type.

China. Yunnan, Xishuangbanna, T. P. Zhu (Zhu Tai-Ping) 139 (holotype KUN: [1206956!], isotype IBSC [0162107!]) .

Description.

Habit a liana. Stems with recurved prickles to ca. 2 mm long, glabrous. Stipules caducous, not seen. Leaves with 3 pairs opposite pinnae, petiole 7-8 cm, rachis 15-20 cm long, rachis with recurved prickles at the base of each pinna and scattered in between the pinnae insertions, pinnae 5-6.5 cm long; leaflets 2-3 opposite pairs per pinna, blade coriaceous, elliptic or narrowly elliptic, base obtuse to cuneate, apex bluntly acuminate, margin incurved abaxially, 6-11.5 × 2.5-4.5 cm, upper surface glossy, lower surface dull, both surfaces glabrous, 2o venation anastomosing, 3o venation finely reticulate. Inflorescence an axillary raceme, more than 20 cm long; pedicels ca. 7 mm. Flowers unknown; receptacle remnant ca. 3 mm wide. Fruit dehiscent, ligneous, oblong to elliptic, slightly asymmetrical, base widely cuneate, apex with beak ca. 2 mm long, venation reticulate, not prominent; 5-7 × 2.8-3.5 cm, ventral suture lacking a wing. Seed 1.

Ecology.

Thickets along riversides, sparse woodlands along roadsides, elevation ca. 600 m.

Phenology.

Flowering unknown, fruiting October.

Distribution.

China (Yunnan) (Map 1 ).

Notes.

Specimen Chen 0066 which is listed as a paratype of T. yunnanensis has leaflets that are asymmetrical, with an asymmetrical base and distinctly acuminate tip, and the secondary veins are at a more acute angle to the midvein when compared with typical T. yunnanensis . It is sufficiently morphologically divergent from the concept of T. yunnanensis to be considered by the current authors to represent a different taxon (not determined), and the characters of that specimen are therefore not included in the description above.

Selected specimens examined.

China. Yunnan: Xishuangbanna, Mengla, Yiwu, J.H. Zhang 19335 (HITBC).

Figures

Map 1. Distribution of all species (excluding T. crista).