112 NORTH AMERICAN FLORA [Volume 32 



33. MACROCNEMUM P. Br. (Hist. Jam. 165; hyponym. 

 1756); h. PI. Jam. Pug. 31. 1759. 



Lasionema D. Don, Phil. Mag. 2: 377. 1833. 



Trees or shrubs, glabrous or pubescent, the branches terete. Stipules interpetiolar, 

 obovate or oblong, deciduous. Leaves opposite, petiolate. Flowers small or of medium size, 

 white or pink, arranged in terminal and axillary panicles; hypanthium oblong; calyx cupular, 

 5-dentate, persistent, the lobes sometimes unequal and petaloid; corolla funnelform or salver- 

 form, the tube elongate, the limb 5-lobate, the lobes broad, spreading, puberulent within, 

 valvate or reduplicate. Stamens 5, inserted near the middle of the corolla-tube, unequal; 

 filaments barbate below; anthers dorsifixed, oblong, included. Disk thick, annular. Ovary 

 2-celled; style filiform, the branches ellipsoid, plane; ovules numerous, peltate, imbricate, 

 the placentae thick, adnate to the septum. Capsule chartaceous, oblong or subcylindric, bisu- 

 cate, 2-celled, loculicidally bivalvate, the septum entire or cleft. Seeds numerous, minute, 

 compressed; testa membranaceous, produced into a narrow entire wing; endosperm fleshy; 

 cotyledons ovate; radicle short, obtuse. 



Type species, Macrocnemum jamaicense L. 



Corolla-tube very stout, 3-4 mm. thick, glabrous outside; calyx-teeth remote; 



flowers long-pedicellate. 1 . M. jamaicense. 



Corolla-tube slender, about 1.5 mm. thick; calyx-teeth approximate; flowers 

 sessile or short-pedicellate. 

 Corolla glabrous outside; hypanthium glabrous or nearly so; leaf -blades acute 



at the base. 2. M. glabrescens. 



Corolla and hypanthium minutely pilose; leaf -blades mostly rounded or sub- 

 cordate at the base. 3. M. pastoense. 



1. Macrocnemum jamaicense L. PI. Jam. Pug. 31. 1759. 



Small tree, 4.5-6 meters high, the branches stout, grayish-brown, minutely puberulent 

 when young, sometimes barbate at the nodes; stipules ovate, oblong, or oval, 2-2.5 cm. long, 

 obtuse, brownish, sparsely strigillose or glabrous; petioles stout, 1-2 cm. long, strigillose; 

 leaf-blades obovate, oval-obovate, or oval-oblong, 1 1-20 cm. long, 4.5-9.5 cm. wide, acute or 

 cuneate at the base, rarely obtuse, acute or abruptly or subabruptly short-acuminate at the 

 apex, with an acute or obtuse acumen, membranaceous, sublustrous, glabrous above, the 

 venation plane or impressed, strigose beneath along the veins, the venation prominent, the 

 lateral veins slender, 7-9 on each side, subarcuate, ascending at an angle of 50° or more, the 

 margin plane; inflorescence terminal and axillary, cymose-corymbose, 7-15 cm. broad, many- 

 flowered, the peduncles 8-20 cm. long, the pedicels stout, mostly 4-12 mm. long; bracts often 

 leaf-like, the bractlets triangular, minute; hypanthium 1-2 mm. long, glabrous; calyx-teeth 

 minute, deltoid, very remote; corolla greenish-yellow, fleshy, glabrous outside, the tube 10- 

 13 mm. long, 3-4 mm. thick, the lobes broadly ovate, 3-4 mm. long, densely papillose-pu- 

 berulent within; anthers 1.5 mm. long; capsule cylindric, 1.5-2.5 cm. long, 3-5 mm. thick, 

 blackish-brown, striate, glabrous, narrowed at each end; seeds elongate, about 2 mm. long, 

 brownish. 



Type locality: Jamaica. 



Distribution: Jamaica; reported from Guadeloupe. 



Illustration: Sw. Obs. pi. 3,f. 1. 



2. Macrocnemum glabrescens (Benth.) Wedd. Ann. Sci. Nat. 

 IV. 1: 76. 1854. 



Lasionema glabrescens Benth. Bot. Voy. Sulph. 105. 1845. 



Tree, 10-15 meters high, the branches stout, brown or grayish, minutely puberulent when 

 young, the internodes short or elongate; stipules oval, oblong, or oblong-ovate, 1-1.8 cm. long, 

 rounded at the apex, minutely strigillose outside; petioles stout, 5-15 mm. long, minutely 

 puberulent or strigillose; leaf-blades obovate, obovate-elliptic, or oval-obovate, 7-21 cm. long, 

 3-8 cm. wide, usually cuneate or attenuate at the base, rarely obtuse, acute or broadly short- 

 acuminate at the apex, sometimes rounded, membranaceous, dark-green above, sublustrous, 

 glabrous, the venation plane or prominulous, or the costa sulcate, paler beneath, strigose along 

 the veins and elsewhere sparsely strigillose or often nearly glabrous, usually sparsely barbate 



