162 MIMOSACEAE. 



2. Mimosa bahamensis Benth. in Hook. Journ. Bot. 4: 408. 1842. 



A much-branched shrub 1.5-3.5 m. high, or a small tree about 4 m. high, the 

 branches armed with short hooked prickles, the twigs densely brown-tomentulose. 

 Petioles, rachis and peduncles tomentulose or raehis glabrate; leaves 4-7 cm. 

 long; petioles 5-20 mm. long; pinnae 2-4 pairs; leaflets 2-6 pairs, oval or obo- 

 vate, 2-6 mm. long, subcoriaceous, glabrous or nearly so, rounded at the apex, 

 subcordate or nearly truncate at the base, the midvein prominent, the lateral 

 venation obscure; heads 1 cm. broad, short-peduncled, axillary and in terminal 

 racemes; calyx about 0.5 mm. long; corolla about 1.5 mm. long, 4-cleft; 

 stamens 8, pink, 2-3 times as long as the corolla; pod linear-oblong, compressed, 

 4-7 cm. long, 12-14 mm. wide, densely brown-tomentulose, 6-10-jointed, both 

 sutures narrowly winged, the wings lacerate or nearly entire; seeds oval- 

 quadrate, smooth, brown, 4-6 mm. long. 



Scrub-lands and thickets, Watling's Island, Rum Cay, Fortune Island, Acklin's 

 Island, Caicos Islands ; Inagua. Endemic. Bahama Mimosa. Haclback. 



The plant recorded by Schoepf as Mimosa aroorea has not been identified. 



8. LEUCAENA Benth. in Hook. Journ. Bot. 4: 416. 1842. 



Unarmed trees or shrubs, with bipinnate leaves, the white flowers in 

 peduncled heads. Calyx narrowly campanulate, 5-toothed. Petals 5, distinct, 

 valvate. Stamens 10, distinct, exserted, the anthers not gland-bearing, often 

 pilose. Ovary stipitate; ovules numerous; style filiform; stigma minute. Pod 

 broadly linear, flat, membranous, completely 2-valved, the ovate or obovate flat 

 seeds transverse. [Greek, referring to the white flowers.] About 10 species, 

 mostly of tropical America, the following typical. 



1. Leucaena glauca (L.) Benth. in Hook. Journ. Bot. 4: 416. 1842. 



Mimosa glauca L. Sp. PI. 520. 1753. 



Usually a shrub 2-3 m. high, but sometimes a small tree, in Porto Rico becom- 

 ing a tree 20 m. high, the young twigs puberulent. Leaves 1-2 dm. long ; petiole 3-6 

 cm. long, with or without a gland ; pinnae 3-10 pairs, the upper ones little shorter 

 than the lower ; leaflets 10^20 pairs to each pinna, oblong or lanceolate, thin, 8-15 

 mm. long, inequilateral, acute at the apex, obliquely narrowed at the base, light 

 green above, pale beneath ; heads globular, axillary or terminal, mostly clustered, 

 1.5-3 cm. in diameter; peduncles stout, puberulent or pubescent, 2-3 cm. long; 

 calyx obconic, 1 mm. long, its short teeth blunt; petals linear-spatulate, pubes- 

 cent; stamens about 3 times as long as the petals; ovary pubescent; pods 

 several or numerous, linear, 10-15 cm. long, about 1.5 cm. wide, abruptly acute 

 or mucronate, tapering at the base, the thin valves with raised margins. 



Pastures, coppices, waste-lands and thickets, throughout the archipelago from 

 Abaco and Great Bahama to the Caicos and Inagua : Bermuda ; Florida ; West 

 Indies ; tropical America : Old World tropics. Probably native of continental trop- 

 ical America. Jumbie Bean. Jimbay. Cow-bush. Catesby 2 : pi. J$. 



9. ACUAN Medic. Theod. 62. 1786. 



Perennial herbs or shrubs, with bipinnate leaves, small stipules, and green- 

 ish or whitish small regular flowers in axillary peduncled heads or spikes. 

 Flowers perfect, sessile, or the lowest sometimes staminate, neutral or apetalous. 

 Calyx campanulate, its teeth short. Petals valvate, distinct, or slightly united 

 or coherent below. Stamens 10 or 5, distinct, mainly exserted; anthers all 

 alike. Ovary nearly sessile; ovules oo. Pod linear, straight or curved, acute, 



