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(Last Modified On 11/15/2012)
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(Last Modified On 11/15/2012)
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Genus
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ALBIZZIA Durazzini
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PlaceOfPublication
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Mag. Tosc. 3:11. 1772.
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Synonym
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Sericandra Raf. Sylva Tellur. 119. 1838. Serianthes Benth. in Hook. Lond. Jour. Bot. 3:84. 1844. Besenna A. Rich. Tent. Fl. Abyss. 1:253. 1847.
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Description
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Trees or shrubs, mostly unarmed, pubescent or glabrous. Leaves few-ranked, usually large, bipinnate, the pinnae and leaflets few to many pairs; petiole gland- ular, the gland usually borne near or below the middle, less frequently above the middle, -but always below insertion of the lowermost pair of pinnae; petiolar gland concave, longitudinally oblong and sunken in the petiole to orbicular and erect; rachis and pinnular rachis usually also bearing glands, especially towards the tips; leaflets small and linear to moderate and ovate, variously pubescent; stipules usually caducous or lacking. Inflorescence of usually subterminal, axillary, pedunculate heads, spikes, or umbels. Flowers pentamerous, synsepalous and sympetalous, regu- lar, almost invariably perfect, white to pink; calyx campanulate to tubular, toothed apically, usually pubescent; corolla mostly funnelform, valvate; stamens numerous, united below into a staminal tube which is usually included; anthers small, egland- ular. Legume linear to oblong, relatively broad but very flat and thin, straight, dry, not septate, indehiscent or tardily dehiscent, the valves never contorted nor elastically dehiscent, the seeds transverse.
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Habit
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Trees shrubs
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Distribution
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Pantropical but relatively rare in the New World.
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Note
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Albizzia is primarily an Old World genus, scarcely distinguishable from Entero- lobium and Pithecolobium (primarily New World). The traditional means of dis- tinguishing the genus (on basis of the legume) is highly inconvenient. New supplementary characters are thus utilized here (especially position of glands: whether on petiole or rachis only) which seem definitely more practical in sep- arating Albizzia from Pithecolobium. Separation of Albizzia from Enterolobium is more difficult in the absence of fruit, but since few species are then involved individual specific characters usually serve to make determination possible. Certain species of Acacia so resemble a few species of Albizzia that detailed examination of the stamens is necessary for determination.
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Key
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a. Leaflets small and narrow (5-11 mm. long and about 2 mm. wide), numerous (9-50 pairs per pinna). b. Leaflets less than 30 pair per pinna, pubescent; mature peduncles 2-3 cm. long; flowers relatively large (calyx about 2.5 mm. long) - 1. A. CARBONARIA bb. Leaflets usually 30 or more pairs per pinna, glabrous; peduncles less than 1.5 cm. long; flowers small (calyx about 1 mm. long) - 2. A. CARIBAEA aa. Leaflets larger and broader (mostly 15-40 mm. long and 10-20 mm. wide), few or several (2-9 pairs per pinna). b. Leaflets tapered and bluntly acute apically; flowers sessile - - 3. A. ADINOCEPHALA bb. Leaflets obtuse or rounded to emarginate apically; flowers pedicellate. c. Flowers all alike, short-pedicellate (pedicels mostly about 2 mm. long); mature leaflets, young twigs, and legume sparingly pubes- cent or glabrous-. .. .,,,,.. ,,,,,,,,,,,,,,,,,,,,, .. . ........ 4. A. LEBBECK cc. Flowers dimorphic, all except center one long-pedicellate (pedicels 8-15 mm. long); mature leaflets, young twigs, and legume tomen- tose to moderately pubescent ,.,.,,..................................... 5. A. LONGEPEDATA
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