Ypsilandra (Franch.) N.Tanaka

Tanaka, Noriyuki, 2019, Taxonomy, evolution and phylogeography of the genus Helonias (Melanthiaceae) revisited, Phytotaxa 390 (1), pp. 448-450 : 448-450

Subsect. 1. Ypsilandra (Franch.) N.Tanaka , comb. & stat. nov.

≡ Ypsilandra Franchet (1887 – 1888: 93, t. 17; 1888: 131, t. 17). Type:― Helonias thibetica (Franch.) N.Tanaka (≡ Ypsilandra thibetica Franch. ).

Japanese name:―Chibetto (Tibet)-shôjôbakama asetsu.

Species included:―5; Helonias alpina , H. jinpingensis , H. parviflora , H. thibetica , H. yunnanensis .

Description:―Leaves usually hysteranthous, rarely proteranthous. Inflorescence racemose. Flowers sometimes unilateral, usually adichogamous, rarely protogynous ( H. thibetica ). Tepals distinct, adaxially almost flat or slightly canaliculate toward base. Nectary at base of tepal nearly flat or slightly concave. Inner filaments adnate basally to base of ovary. Anthers basifixed, unilocular. Styles 3, connate proximally to almost entirely. Stigma trisected to slightly trilobed, rarely discoid or (sub)capitate. Flowering spring, rarely late summer to early autumn ( H. jinpingensis ).

Distribution:― Bhutan, China, India, Myanmar, Nepal, Vietnam (Figs. 15, 31-2, 32-2).

Remarks:―Subsection Ypsilandra and Helonias bullata of sect. Helonias are compared in Table 6. A key to the species of subsect. Ypsilandra is below.

Identification key to the species of H. subsect. Ypsilandra

1.

-.

2.

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3.