Heloniopsis

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

Ser. 2. Heloniopsis

Japanese name:―Shôjôbakama retsu.

Species included:―3; Helonias breviscapa , H. koreana , H. orientalis .

Description:―Leaves hysteranthous, somewhat thin to thick in texture, dull to glossy, light (yellowish) green or green adaxially, minutely undulate or entire along margins, sometimes producing plantlet adventitiously at tip of leaf in the wild ( H. orientalis ). Inflorescence (sub)umbellate at anthesis, rachis often elongating with age. Flowers vernal, funnelform (obconic) or campanulate. Tepals adaxially canaliculate toward base, proximal submarginal portions winged (lamellate) inward, connate basally to adjoining tepals and also adnate to opposite filaments, forming a tubular nectary. Adnate portions between filament and opposing tepal and connate portions between adjoining tepals positioned higher than base of ovary (or apical surface of receptacle). Anthers affixed to filament adaxially at or close to base of connective (i.e. nearly basifixed or (sub)dorsi-basifixed), bilocular with vestigial apical confluence between thecae. Stigma thin to thick discoid or subcapitate, sometimes trilobed.

Distribution:― Japan, Korea, E Russia (S Sakhalin) ( Figs. 29-B , -Ko, -O, 31-4, 32-4).

Remarks:―All members of this series are confined to islands and peninsulas of Far East Asia ( Figs. 29 ), suggesting the past subsidence of land bridges (discussion in Part III-5). Several characters of the three species are compared in Table 9. A key to the species is below.

Identification key to the species of H. ser. Heloniopsis

1.

-.

2.

Figures

FIGURE29.Distributionofsixspeciesbelongingtotwoseriesofsubsect.HeloniopsisinEAsia.B:Heloniasbreviscapa.Ka:H.kawanoi.Ko: H.koreana.L:H.leucantha.O:H.orientalis.U:H.umbellata.Ser.UmbellataecomprisesKa,LandU.Ser.HeloniopsisconsistsofB,KoandO.