Cedrelinga

Taxonomy

Cedrelinga W.A. Ducke Arch. Jard. Bot. Rio de Janeiro 3: 70. 1922. 

Subfamily: Mimosoideae.
Phylogenetic Number: 2.5.24.
Tribe: Ingeae.
Species Studied - Species in Genus: 1 studied; 1 in genus.

Description

Fruit: A legume; unilocular; 50–60 cm long; 3–5.5 cm wide; 0.1–0.3 cm thick; more than 9 times longer than wide; with deciduous androecial sheath; with deciduous corolla; with deciduous calyx; without orifice formed by curving of fruit or fruit segments; straight; not plicate; twisted (at joints), or not twisted; symmetrical; broadly linear; not inflated; flattened; without beak; rounded at apex; aligned with longitudinal axis of fruit; short tapered at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; coriaceous; seed chambers externally visible; margin constricted; margin constricted along both margins; margin without sulcus; margin plain; wing(s) absent; stipitate; with the stipe up to 25 mm long; indehiscent (remaining attached to sutures). Replum invisible. Epicarp dull; monochrome; brown; with surface texture uniform; glabrous; eglandular; without spines; not smooth; with elevated features; veined; reticulately veined; not tuberculate; not exfoliating; without cracks; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp absent. Endocarp present; visible; dull; opaque; monochrome; brown; smooth; without adhering pieces of testa; septate (around seed (not transversely septate)); not exfoliating; entire. Seed(s) up to 6; length parallel with fruit length; neither overlapping nor touching; in 1 series. Funiculus up to 30 mm long; of 1 length only; filiform; plicate. Aril absent.

Seed: 25–36 mm long; 15–18 mm wide; 1–2 mm thick; not overgrown; not angular; symmetrical; sub circular; flattened; with surface smooth; without visible radicle and cotyledon lobes; without hilar sinus; without umbo on seed faces; without medial ridge on each face. Cuticle not exfoliating; not inflated; not wrinkled. Testa present; without pieces of adhering epicarp; not adhering to endocarp; free from endocarp; glossy; not modified by a bloom; colored; monochrome; brown; glabrous; not smooth; with elevated features; rugose; chartaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) absent. Raphe not visible. Hilum present; visible; without faboid split; punctiform; according to embryonic axis subapical to radicle tip and marginal according to radicle tip (nearly, according to seed length); flush; not within corona, halo, or rim. Lens discernible; 0.1 mm long; with margins straight; linear; not in groove of raphe; mounded; similar color as testa; darker than testa; black; not within corona, halo, or rim. Endosperm absent. Cotyledons smooth; both outer faces flat; both the same thickness; both more or less of equal length; not folded; margin entire 180 degrees from base of radicle; similar at apex; partially concealing radicle, or not concealing radicle; split over radicle, or notched at radicle; with the interface division terminating at base of radicle; without margins recessed; inner face flat; glabrous on inner face. Embryonic axis slightly deflexed to straight; oblique to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; centered between cotyledons. Plumule rudimentary; glabrous.

Distribution

Amazon basin of Ecuador, Peru, and Brazil and French Guiana.

New World; South America (Amazon basin of Ecuador, Peru, and Brazil and French Guiana); Peru, Brazil, Ecuador, and the Guianas.

Generic Notes

The fruit and seed are unusual in the subfamily. Barneby and Grimes (1996) monographed the genus, and their distribution is used.