Thuranthos (C. H. Wright) J. C. Manning & Goldblatt

Manning, John, 2022, New combinations in Drimia Jacq. ex Wild. (Hyacinthaceae: Urgineoideae) and an updated key to the southern African species, Bothalia (a 2) 52 (1), pp. 1-7 : 6

Sect. Thuranthos

1a. Stamens 3 (inner whorl only), filaments ± 4 mm long; tepals 4.5–5.5 mm long........21.1. D. pellabergensis

1b. Stamens 6, filaments> 5 mm long; tepals> 6 mm long:

2a. Inflorescence to 400 mm long; pedicels 8–12 mm long, abscising ± midway if not pollinated; tepals 7–8 mm long; filaments 6–8 mm long; capsules 5–7 mm long; plants from southwestern Western Cape................................................................ 21. D. hesperantha 2b Inflorescence 150–1 300 mm long; pedicels 15–80 mm long, abscising at base if not pollinated; tepals 8–33 mm long; filaments 7–20 mm long; capsules 7–40 mm long; plants from Eastern Cape northwards: 3a. Filaments fusiform, constricted basally, ± 7 mm long; anthers subglobose-sagittate, ± 1 mm long at anthesis; capsules on slender, horizontally spreading pedicels, subglobose-ovoid, ± 7 mm long; leaves terete-canaliculate, 0.5–1.0 mm diam........................................ 22. D. vespertina 3b. Filaments filiform or lanceolate, sometimes abruptly narrowed midway but never constricted basally, 5–20 mm long; anthers oblong, 1.5–7.0 mm long; capsules on thickened, suberect pedicels, subglobose to ellipsoid, 3-lobed, 8–40 mm long; leaves linear-canaliculate, 4–18 mm wide: 4a. Leaf sheaths unmarked; tepals 22–33 mm long; filaments 15–20 mm long, basal 6–12 mm flattened and incurved around ovary forming a cage-like structure, sharply constricted and terete-fusiform above; style several times longer than ovary; stigma large and capitate..............25. D. macrantha 4b. Leaf sheaths barred or blotched with purple towards base; tepals 9–20 mm long; filaments 5–11 mm long, simple and lanceolate or fusiform; style as long as or slightly longer than ovary; stigma 3-angled: 5a. Inflorescence more than 500 mm tall; pedicels 35–80 mm long; tepals 14–20 mm long; filaments 7–11 mm long....................................................... 24. D. pauciflora 5b. Inflorescence mostly up to 500 mm tall; pedicels 10–30 mm long; tepals 6–12 mm long; filaments 5–6 mm long: 6a. Bulb scales loose and spathulate; leaves keeled beneath; pedicels 10–12 mm long at anthesis; filaments ± 6 mm long............................................... 23. D. zambesiaca 6b. Bulb scales cohering; leaves rounded beneath; pedicels 20–30 mm long at anthesis; filaments ± 10 mm long.........................................................23.1. D. zebrina