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allamanda

Habit Shrubs [lianas, subshrubs, trees]; latex milky.
Stems

trailing [erect], unarmed, glabrous or eglandular-pubescent.

Leaves

persistent, whorled [subwhorled], rarely opposite [distally alternate], petiolate or sessile;

stipular colleters present, intrapetiolar;

laminar colleters absent.

Inflorescences

axillary or subterminal, cymose, pedunculate.

Flowers

calycine colleters absent;

corolla yellow [pink, red, violet], funnelform, aestivation sinistrorse;

corolline corona dissected;

androecium and gynoecium not united into a gynostegium;

stamens inserted near top of corolla tube;

anthers not connivent, not adherent to stigma;

connectives not appendiculate, locules 4;

pollen free, not massed into pollinia, translators absent;

nectary annular.

Fruits

capsules, solitary, erect, green or tinged with purple-red, subglobose to globose, surface spiny [smooth], glabrous.

Seeds

orbiculate to ovoid, flattened, winged, not beaked, not comose, not arillate.

x

= 9.

Allamanda

Distribution
from USDA
South America [Introduced, Florida; some species introduced in tropical regions nearly worldwide]
[BONAP county map]
Discussion

Species ca. 15 (1 in the flora).

The systematic position of Allamanda within Apocynaceae has long been uncertain. At anthesis the ovary is compound, leading K. M. Schumann (1895) to place Allamanda with other genera with compound ovaries in a supposed primitive alliance in the family. M. E. Fallen (1985) has demonstrated that the compound ovary is derived from a gynoecium with two separate ovaries and, based on both molecular and morphological evidence (A. O. Simões et al. 2007), the genus is currently placed in the Plumerieae clade of the subfamily Rauvolfioideae.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Parent taxa Apocynaceae
Subordinate taxa
A. cathartica
Name authority Linnaeus: Mant. Pl. 2: 146, 214 (1771) — as Allemanda
Source FNA vol. 14. Treatment author: David E. Lemke.
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