Part 2, 1921] RUBIACEAE 157 



calyx 3-3.5 mm. long, truncate, sericeous within; corolla yellowish-white, about 2.5 cm. long, 



the tube glabrous at the base, sericeous above, the 5 lobes oblong or oval, rounded at the apex, 



sericeous, longer than the tube, the throat villous; anthers 1.5 cm. long. 



Type locality: Near Boca Matapalo, Pacific coastal belt, Costa Rica, at sea level. 

 Distribution: Known only from the type locality. 



4. Genipa Williamsii Standley, Jour. Wash. Acad. Sci. 8: 

 642. 1918. 



Tree, 10 meters high, the trunk 12.5 cm. in diameter, the branchlets reddish-brown, 



glabrous, the internodes short; stipules broadly obovate, 1.8 cm. long, 1.2 cm. wide, cuneate 



at the base, rounded at the apex, brownish, sparsely strigose outside; petioles stout, 1-2.5 cm. 



long, glabrate; leaf-blades obovate or oblong-obovate, 12.5-19 cm. long, 6-9.5 cm. wide, acute 



or cuneate at the base, rounded at the apex, chartaceous, green above, sublustrous, glabrous, 



the venation plane or prominulous, brownish beneath, strigose along the veins, the costa stout, 



prominent, the lateral veins slender, 8 or 9 on each side, ascending at an obtuse angle, nearly 



straight, laxly anastomosed near the margin; fruit subglobose, 4.5 cm. in diameter, terminal, 



solitary, subsessile, the pericarp very thick; seeds (very immature) numerous. 



Type locality: Vicinity of Cana, Panama, altitude 1350 meters. 

 Distribution: Known only from the type locality. 



59. AMAIOUA Aubl. PI. Guian. Suppl. 13. 1775. 



Trees or shrubs, the branchlets terete or tetragonous, usually sericeous. Leaves opposite 

 or ternate, short-petiolate. Stipules interpetiolar, triangular or ovate, united into a conic 

 cap, deciduous. Flowers white, arranged in short-pedunculate terminal fascicles or cymes, 

 dioecious; hypanthium oblong to hemispheric; calyx cupular or short- tubular, deciduous, 

 truncate or 6-dentate, the teeth short, subulate; corolla salverform, sericeous outside, the 

 tube terete or ventricose, the throat tomentose, the limb 6-lobate, the lobes oblong, 

 spreading, contorted. Stamens 6, inserted in the corolla-tube; filaments very short; anthers 

 dorsifixed, linear, acute, included. Disk annular or swollen. Ovary 2-celled or sometimes 

 almost 1 -celled; style short, thickened above, the 2 branches coherent; ovules numerous, 

 biseriate, the placentae thick, affixed to the septum. Fruit baccate, small, oblong, areolate 

 at the apex, 1 -celled, the cortex thin-coriaceous. Seeds numerous, embedded in pulp, hori- 

 zontal, compressed, suborbicular, the testa fibrous; endosperm corneous; embryo small, the 

 cotyledons ovate, the radicle short, clavate. 



Type species, Amaioua guianensis Aubl. 



1. Amaioua corymbosa H. B. K. Nov. Gen. & Sp. 3: 419. 1820. 



Gardenia hexandra Willd.; R. & S. Syst. Veg. 5: 243. 1819. 



Amaioua fagifolia Desf. Mem. Mus. Paris 6: 14. 1820. 



Amaioua guianensis Hemsl. Biol. Centr. Am. Bot. 2: 39. 1881. Not A. guianensis Aubl. 1775. 



Shrub, 2-5 meters high, the branches grayish or brown, the branchlets stout, subangulate, 

 ferrugino-sericeous, the internodes stout; stipules lance-oblong, 1.5-2.5 cm. long, ferrugino- 

 sericeous outside, glabrous and glandular within; petioles stout, 3-15 mm. long, densely fer- 

 rugino-sericeous; leaf-blades oval, ovate-oval, or oval-elliptic, 5-20 cm. long, 3-10 cm. wide, 

 broadly rounded to short-acuminate at the base, short-acuminate at the apex, coriaceous, 

 green above, glabrous, the venation impressed, paler beneath, brownish, more or less sericeous 

 along the veins, the venation prominent, the lateral veins stout, about 7 on each side, arcuate- 

 ascending, the margin plane or subrevolute; staminate inflorescence corymbose, lax, often 

 long-pedunculate, the calyx cupular, 3-4 mm. long, sericeous, 6-denticulate, the corolla about 

 1.8 cm. long, the tube retrorse-sericeous, the lobes lanceolate, about as long as the tube; anthers 

 7 mm. long; pistillate inflorescence capitate or corymbose, few-flowered, long- or short-peduncu- 

 late, the calyx and hypanthium 3-4 mm. long, the corolla about 1 cm. long; fruit oval or 

 obovoid, 1.2-1.5 cm. long, sparsely sericeous; seeds compressed, irregularly angulate, about 

 3 mm. long, reddish-brown, lustrous, striolate. 



Type locality: Near Cumanacoa, Venezuela. 

 Distribution: Panama to the Guianas; Cuba. 

 Illustrations: H. B. K. Nov. Gen. & Sp. pi. 294; Mem. Mus. Paris 6: pi. 5. 



