146 NORTH AMERICAN FLORA [Volume 32 



dimorphous, the heads axillary, solitary, sessile or pedunculate; hypanthium ovoid or turbinate; 

 calyx 4-lobate, the lobes narrow, persistent; corolla funnelform, the throat glabrous, the 

 limb 4-lobate, the lobes oblong, valvate. Stamens 4, inserted in the tube of the corolla; 

 filaments short; anthers dorsifixed near the base, oblong-linear, obtuse, bilobate at the base, 

 short-exserted or included. Disk annular, bilobate. Ovary 2-celled; style slender, with 2 

 short or subelongate branches; ovules numerous, horizontal, the placentae small, adnate to 

 the septum. Fruit baccate, ovoid, 2-celled, blue. Seeds numerous, orbicular, subangulate, 

 plano-convex, the hilum ventral, the testa subcoriaceous, granulate ; endosperm fleshy ; embryo 

 small, the cotyledons ovate, the radicle terete. 

 Type species, Tontanea guianensis Aubl. 



Pubescence of the stems appressed or ascending, at least on young stems; flower- 

 heads often sessile or subsessile. 

 Heads many-flowered, pedunculate; calyx-lobes obtuse. 1. T. canescens. 



Heads usually 3-flowered, often sessile; calyx-lobes very acute. 



Flower-heads pedunculate. 2. T. tenuis. 



Flower-heads all or mostly sessile. 



Upper surface of the leaves appressed-pilose with short hairs. 3. T. herbacea. 



Upper surface of the leaves hirsute with long spreading hairs. 4. T. hispidula. 



Pubescence of the stems widely spreading or reflexed ; flower-heads pedunculate. 



Leaves appressed-pilose on the upper surface with short hairs. 5. T. guianensis. 



Leaves hirsute with long spreading hairs. 



Leaf-blades broadly ovate, rounded at the base. 6. T. hirsuta. 



Leaf-blades mostly reniform. 7. T. pleuropoda. 



1. Tontanea canescens (Willd.) Standley. 



Coccocipsilum repens H. B. K. Nov. Gen. & Sp. 3:316. 1819. Not C. repens Sw. 1788. 

 Coccocipsilum canescens Willd.; Cham. & Schlecht. Linnaea 4: 139. 1829. 



Branches stout, densely pilose-sericeous when young with yellow or whitish hairs ; stipules 

 linear-subulate, 3-10 mm. long; petioles stout, 0.4-2.5 cm. long, densely pilose with long, 

 appressed or sometimes spreading hairs; leaf-blades oblong, ovate-oblong, or broadly ovate, 

 2-8 cm. long, 1-3.5 cm. wide, subcordate to obtuse at the base, acute or obtuse at the apex, 

 densely pilose above with short, subappressed, mostly yellowish hairs, densely pilose beneath 

 with longer, whitish or yellow, appressed or somewhat spreading hairs, the lateral veins nu- 

 merous, conspicuous, arcuate; heads densely many-flowered, on peduncles 1-6 cm. long; 

 bracts often large and foliaceous; calyx and hypanthium densely long-pilose, the calyx-lobes 

 oblong or ovate, 2-3 mm. long, foliaceous, usually obtuse, twice as long as the hypanthium; 

 corolla purplish-blue, about 5 mm. long, densely pilose, the lobes oblong or lance-oblong, 

 obtuse or acute, nearly as long as the tube; fruit densely pilose, 5-7 mm. in diameter, bright- 

 blue; seeds dark-brown, about 1.2 mm. broad. 



Type locality: Near Popayan, Colombia. 



Distribution: Guatemala to Peru and Brazil; reported from Oaxaca. 



2. Tontanea tenuis (Urban) Standley. 



? Coccocipsilum pseudotontanea Griseb. Fl. Brit. W. Ind. 322. 1861. 

 Coccocipsilum tenue Urban, Repert. Sp. Nov. 13: 479. 1915. 



Stems slender, pilose when young with short, appressed or ascending hairs; stipules linear- 

 subulate, 1-3 mm. long; petioles slender, 4-13 mm. long, pilose like the stems; leaf-blades 

 ovate, rounded-ovate, oblong-ovate, or oblong, 1.5-4 cm. long, 0.8-2.2 cm. wide, rounded or 

 subtruncate at the base, often abruptly short-decurrent, acute or obtuse at the apex, often 

 apiculate, appressed-pilose with short hairs, or the pubescence spreading beneath; heads 

 2-3-flowered, on peduncles 0.3-2.4 cm. long; bracts linear, 3-4 mm. long; calyx and hypanthium 

 densely short-pilose, the calyx-lobes linear, acute, 2-4 mm. long, more than twice as long as 

 the hypanthium; corolla 5 mm. long, short-pilose, the lobes lance-triangular, half as long as 

 the tube; fruit short-pilose, 3-6 mm. in diameter. 



Type locality: Jamaica. 



Distribution: Eastern Cuba, Jamaica, and Trinidad. 



