Latin name and synonyms:
Maguire & Boom (1989)
Etymology: The genus Sipapoantha is named after the mountain
Cerro Sipapo in southern Venezuela. The ending -antha means flower.
Cerro Sipapo, in Amazonas State, Venezuela, and in Roraima
herb. Stem quadrangular, often with 4 narrow wings. Leaves mainly at the
base in a rosette or nearly so, smaller toward higher up, sessile, obovate
(lower leaves) to broadly elliptic (upper leaves), very thick and
leathery; base narrowly attenuate; apex obtuse; margin strongly recurved.
Inflorescence terminal, cymose, 1–3 branches, 1–7-flowered. Flowers
5-merous, slightly zygomorphic (anthers aggregated in upper part of
corolla mouth and style bent). Calyx campanulate, divided ca. 2/3 of the
length, thick and leathery, persistent, lobes oblong, obtuse, with a
dorsal thick ridge, obtuse. Corolla showy and large, funnelform, dark blue
to purple, thin, deciduous in fruit, lobes elliptic to circular, obtuse,
corolla bud apex rounded. Stamens inserted very close to base of corolla
tube; filaments of unequal length, widened at the base; anthers lanceolate,
sagittate, straight after anthesis, versatile, with a sterile apical
appendage. Pollen in tetrads; exine reticulate, small globules. Ovary with
glandular disk; style long, slender, deciduous in fruit; stigma
bilamellate; lobes broadly circular. Capsule woody, oblong, dehiscing
medially, nodding. Seeds angular, not winged, testa cells concave with
and related plants:
uses: None known.
species (synonyms in parenthesis) and their distribution:
B. & B. M. Boom. 1989. Gentianaceae, part 3. Pp. 2-56. In: B. Maguire
& collaborators, editors. The Botany of the Guayana Highland – Part
XIII. Mem. New York Bot. Gard. 51.
L., J. W. Kadereit, J. Klackenberg, S. Nilsson, M. Thiv, K. B. von Hagen,
& V. A. Albert. 2002. Systematics, character evolution, and
biogeography of Gentianaceae, including a new tribal and subtribal
classification. Pp. 21-309. In: L. Struwe & V. A. Albert (eds.),
Gentianaceae: Systematics and Natural History, Cambridge University Press,
L., P. J. M. Maas, O. Pihlar, & V. A. Albert. 1999. Gentianaceae. Pp.
474-542. In: P. E. Berry, K. Yatskievych, & B. K. Holst, editors.
Flora of the Venezuelan Guayana, vol. 5. Missouri Botanical Garden, St.
© Lena Struwe, 2004-2011