Rondeletieae (Rubiaceae): Part I (Rustia, Tresanthera ... - CNCFlora

22 Flora Neotropica
entire margin; stipules obovate to ellipticobovate,
15-30 mm long, foliaceous; seeds
prominently winged (Colombia)
......................................... Cuatrecasasiodendron
33. Corollas actinomorphic, 4-5-lobed; the
innermost lobe equal in size to the other,
with entire margin; the outer 1 to 2 lobes
undulate-crenulate; stipules deltoid to
lanceolate, 3 cm long.
35. Corollas narrowly campanulate, red; corolla tube narrowly imbutiform
(Cerrado and Atlantic forests of Brazil) ... Augusta subgen. Augusta
35. Corollas hypocrateriform, white; corolla tube narrowly tubular.
36. Calyx lobes linear; seeds with lateral hilum (truncate at apex),
not winged, horizontally attached to the central placenta
(Central America and South Pacific Islands) .. Augusta subgen. Lindenia
36. Calyx lobes oblong-obovate; seeds with central hilum,
with shallow concentric wing, vertical, peltately attached
to the central placenta (Venezuelan tepuis) ........... Maguireothamnus
34. Corollas 2 x 1 cm.
38. Ovary 4-locular, with 5-6 ovules per locule; mature
fruits dividing into 4 cocci (Colombia) .............................. Acrobotrys
38. Ovary 2-locular, with numerous ovules per locule (>6);
mature fruits not dividing into 4 cocci (but old capsules of
Chalepophyllum
splitting into 4 parts, though not into 4 cocci).
39. Inflorescences axillary (not subterminal), at the axils
of the last 5-7 nodes below the apical bud, in congested
cymules of 1-4 flowers.
40. Corollas hypocrateriform, white (the tubes
sometimes suffused with pinkish-reddish tinge
at base); resinous exudates from young stipules
copious; calyx lobes narrowly oblong to narrowly
lanceolate, subcoriaceous, unequal, 1-3 mm wide,
fully expanded before anthesis; seeds with a narrow
marginal expanded wing, 3-4 mm long (high
elevations of Venezuela and Guianas)......... Chalepophyllum
40. Corollas narrowly campanulate, salmon-red;
resinous exudates from young stipules scant;
calyx lobes lanceolate, membranous, subequal,
4-6 mm wide,expanding after anthesis; seeds
unwinged, to 1 mm long (high elevations of
Amazonian Venezuela) ...................................... Holstianthus
39. Inflorescences terminal, in corymbose panicles of
9-40 flowers.
41. Inflorescences 10 cm long; flowers subcampanu-
late; calyx lobes widely ovate; stipules readily
caducous (Colombia and Peru) ................................. Phitopis