Part 2, 1921] RUBIACEAE 131 



42. OUROUPARIA Aubl. PI. Guian. 177. 1775. 



Uncaria Schreb. Gen. 125. 1789. 

 Uruparia Kuntze, Rev. Gen. 301. 1891. 



Scandent shrubs, glabrous or pubescent, climbing by stout hooked spines, these formed 

 from abortive peduncles. Leaves opposite, petiolate. Stipules interpetiolar, entire or bifid. 

 Flowers yellowish, usually pubescent, aggregate in dense globose heads, sessile or pedicellate, 

 the heads pedunculate, axillary and solitary or paniculate; hypanthium elongate, fusiform, 

 the calyx campanulate, funnelform, or short-tubular, 5-lobate or 5-partite; corolla tubular- 

 funnelform, the tube elongate, glabrous in the throat, the limb 5-lobate, the lobes valvate. 

 Stamens 5, inserted in the throat of the corolla; filaments short; anthers oblong, dorsifixed, 

 bisetose at the base. Disk inconspicuous. Ovary fusiform, 2-celled; style slender, long- 

 2xserted, the stigma capitate; ovules numerous, ascending, the placentae affixed to the septum. 

 Capsule elongate, 2-celled, septicidally bivalvate, the valves bipartite. Seeds numerous, 

 imbricate, the body small, the testa winged at each end, the wings often bipartite; endosperm 

 fleshy; embryo clavate, the cotyledons short, the radicle obtuse. 



Type species, Ouronparia guianensis Aubl. 



1. Ourouparia tomentosa (Willd.) K. Schumann, in Mart. Fl. 

 Bras. 6 6 : 132. 1889. 



Nauclea aculeata H. B. K. Nov. Gen. & Sp. 3: 382. 1819. Not N. acnleata Willd. 1797. 

 Nauclea tomentosa Willd.; R. & S. Syst. Veg. 5: 221. 1819. 

 Uncaria tomentosa DC. Prodr. 4: 349. 1830. 



Scandent shrub, the branchlets quadrangular, densely or sparsely pilose or puberulent, 

 glabrate in age, the internodes elongate; stipules broadly oblong-ovate to broadly deltoid- 

 rounded, 6-11 mm. long, obtuse or rounded, short-pilose or puberulent, green, often reflexed; 

 petioles stout, 7-15 mm. long; leaf-blades oval or ovate-oval, 9.5-15.5 cm. long, 5.5-8.5 cm. 

 wide, broadly rounded or cordate at the base, very shortly obtuse-acuminate at the apex, 

 chartaceous, very lustrous above, bright-green, glabrous, the venation plane, paler beneath, 

 whitish-tomentulose, or in age glabrate except along the veins, there pilose, the lateral veins 

 prominent, arcuate; heads paniculate, numerous, about 6 mm. in diameter (exclusive of the 

 corollas), the peduncles naked, 3.5 cm. long or shorter, often compressed, the lowest ones usually 

 sterile and spinose, large, flat, recurved; flowers sessile; calyx and hypanthium about 2 mm. 

 long, the hypanthium sericeous, the calyx obscurely 5-dentate, puberulent, the teeth rounded; 

 corolla 6 mm. long, densely retrorse-pilose outside with appressed yellowish hairs, the teeth 

 very slender, the lobes oval or oblong, rounded at tne apex, about 1.5 mm. long; fruit tri- 

 gonous, 2-3 mm. long. 



Type locality: Banks of the Magdalena River near Nares, Colombia. 

 Distribution: Guatemala to Colombia and Surinam; also in Trinidad. 

 Illustration: Karst. Fl. Columb. pi. 180, f. it, 13. 



VI. MUSSAENDEAE. Trees, shrubs, or herbs, sometimes scandent. 

 Flowers usually perfect; calyx-lobes sometimes unequal, one of them expanded 

 into a foliaceous limb; corolla-lobes valvate. Stamens usually inserted in the 

 tube of the corolla, rarely in the throat. Ovary 2-6-celled, the ovules nu- 

 merous. Fruit indehiscent and fleshy, baccate, or of 2 or more cocci. Seeds 

 small or minute, exalate, usually globose or angulate; endosperm fleshy; 

 embryo minute, ovoid or clavate ; radicle inferior. 



Inflorescence terminal. 



Flowers in dense heads. 43. UrcEOLARIA. 



Flowers not in heads. 



Calyx-lobes dissimilar, one of them expanded into a large colored 



limb. 44. Mussaenoa. 



Calyx-lobes similar, small. 



Inflorescence a spike-like panicle; leaves membranaceous; ovary 



2— {.-celled. 45. Duggena. 



Inflorescence broad, not spike-like; leaves coriaceous. 



Ovary 2-celled; corolla tuberculate outside. 46. Cassupa. 



Ovary 4-6-celled; corolla not tuberculate. 47. Isertia. 



Inflorescence axillary. 



