Subfamily: Mimosoideae.
Phylogenetic Number: 2.5.13.
Tribe: Ingeae.
Species Studied - Species in Genus: 4 studied; 5 in genus.
Fruit: A legume; unilocular; 4–15 cm long; 1–2.5 cm wide; 0.3–5 cm thick; 2–9 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; not twisted; symmetrical; oblong, or linear (Barneby and Grimes, 1996); not inflated; flattened; with beak, or without beak; straight; with solid beak the same color and texture as fruit; rounded at apex, or tapered at apex, or short tapered at apex; aligned with longitudinal axis of fruit; short tapered at base to long tapered at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; chartaceous; seed chambers externally faintly visible; seed chambers with the raised seed chambers not torulose; margin constricted, or not constricted; margin constricted along both margins; margin without sulcus; margin plain; wing(s) absent; stipitate, or substipitate; with the stipe 5–16 mm long (Barneby and Grimes, 1996); with all layers dehiscing; splitting along suture(s). Dehiscence of valves along both sutures; passive (separating but not twisting, remaining attached to sutures). Replum invisible. Epicarp dull; monochrome; reddsh brown with grayish cast caused by pubescence to blackish brown; with surface texture uniform; glabrous, or pubescent and indurate; with hairs erect; with 1 type of pubescence, or 2 types of pubescence; puberulent, or tomentose; with pubescence brown, or brown and red (Havardia albicans (C.S. Kunth) N.L. Britton & J.N. Rose); with pubescence uniformly distributed, or pubescence denser near sutures, sparser centrally; with simple hairs, or simple hairs and complex hairs; with coralloid hairs (Havardia albicans (C.S. Kunth) N.L. Britton & J.N. Rose); pliable; with hair bases plain; eglandular; without spines; not smooth; with elevated features; not veined, or veined; transversely veined relative to fruit length (parallelly); not tuberculate; not exfoliating; without cracks; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp present; thin, or trace; surface not veined; 1-layered; without balsamic vesicles; without fibers; without reniform canals; spongy (when thin), or vitriol (when trace); chartaceous. Endocarp present; visible; dull; opaque; monochrome; tan (and usually darker in seed chamber); smooth; without adhering pieces of testa; nonseptate; chartaceous; not exfoliating; remaining fused to mesocarp and epicarp; entire. Seed(s) 7–13 (Barneby and Grimes, 1996); length transverse to fruit length; neither overlapping nor touching; in 1 series. Funiculus 4–10 mm long; of 1 length only; thick; plicate. Aril absent.
Seed: 5–12 mm long (Barneby and Grimes, 1996Barneby and Grimes, 1996:
Albizia, and allies. Mem. New York Bot. Gard. 74(1): 1&-292.
); 4–10 mm wide (Barneby and Grimes, 1996); 1.2–2 mm thick (Barneby and Grimes, 1996); not overgrown; not angular; symmetrical; circular, or elliptic, or oblong; flattened; with surface smooth; without visible radicle and cotyledon lobes; with shallow 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; dull, or glossy; not modified by a bloom; colored; monochrome; blackish brown to brown; glabrous; smooth to not smooth; with elevated features, or recessed features; shagreen; pitted with small separate pits (especially when immature); coriaceous. Pleurogram present; 95–100 %. Pseudopleurogram absent. Fracture lines present; reticulate. Rim absent. Wing(s) absent. Raphe not visible. Hilum present; fully concealed; concealed by funicular remnant; without faboid split; larger than punctiform; 0.3–0.4 mm long; with curved outline; circular, or elliptic; apical at apex of radicle tip; flush; not within corona, halo, or rim. Lens discernible; 0.1–0.4 mm long; with margins straight, or curved; linear; circular; not in groove of raphe; confluent with hilum, or adjacent to hilum; 0–0.1 mm from hilum; flush; dissimilar color from testa; lighter than testa; white; not within corona, halo, or rim. Endosperm present; thin; not pluglike and not resembling tip of radicle; adnate to testa. 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; completely concealing radicle, or partially concealing radicle; split over radicle; with lobes; with lobes overlapping; with basal groin formed by lobes; with the interface division terminating at base of radicle; without margins recessed; tan; inner face flat; glabrous on inner face. Embryonic axis straight; parallel to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; bulbose, or triangular; lobe tip straight; straight with embryonic axis; centered between cotyledons; less than 1/2 length of cotyledons. Plumule well developed; glabrous.
Seed, cotyledon, embryo, and testa: H. mexicana (Rose) Britton & Rose - testa SEMs; H. pallens (G. Bentham) Britton & J.N. Rose - bottom far left seed topography, top left cotyledon concealing radicle (L) and embryonic axis (R); H. sonorae (S. Watson) Britton & J.N. Rose - bottom left center seed topography; H. spp. - bottom center seeds.
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