Calliandra tergemina var. emarginata (Humb. & Bonpl. ex Willd.) Barneby, Mem.New York Bot. Gard. 74 (3): 129. 1998; C. emarginata (Humb. & Bonpl. ex Willd.) Benth., London J. Bot. 3: 95. 1844; C. rupestris Brandeg., Zoe 5: 199. 1905; Inga emarginata Humb. & Bonpl. ex Willd., Sp. Pl. 4: 1009. 1806.

Medium-sized shrub up to 6-7 ft. Branchlets cylindric, brown, pubescent. Stipules ovate- lanceolate, margin ciliate, persistent. Leaves alternate, bipinnate; rachis and rachillae adaxially channelled, pubescent; rachillae ending in soft appendage; pinnae two; each pinna with 3 leaflets on rachillae, upper (or terminal) leaflets in pair, lower leaflet odd (or unpaired) and small; leaflets 2-8.5 cm long, sessile to subsessile, asymmetrical, oblong or obovate, apex acute to obtuse, mucronate, margin entire, pubescent beneath. Flowers 20+ in heads, heads axillary, globose, pedunculate, peduncles pubescent, floral buds purplish-red. Flowers bracteate, actinomorphic, bisexual, 5-merous, hypogynous, up to 5 cm long and ca. 6 cm across, sessile or subsessile. Calyx red, tubular-campanulate; tube 3-4 mm long; limb 5-toothed, teeth 0.5 mm long, triangular. Corolla purplish-red funnelform; tube 6-8 mm long; limb 5-lobed, lobes triangular-ovate, reflexed. Stamens numerous, scarlet, very bright, 4-5 cm long, monoadelphous at base; filaments much exserted, deep red, filiform; anthers small, eglandular. Monocarpellary, ovary stipitate, unilocular, many-ovuled, placentation marginal; style nearly as long as stamens, filiform; stigma minute, capitate. Legumes dull brown, stipitate, linear-oblanceolate, flat, strap-shaped, straight or slightly falcate, rigidly leathery, narrowed to base, thick ridges at sutures, 2-valved, apex beaked or rounded.

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