114 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



The three identified species at present known to occur in Colombia 

 and Central America can be distinguished by means of the following 

 key: 



Corona leaflets inappendiculate 0. riparium. 



Corona leaflets appendiculate: 



Membrane of the anthers rounded at tip (). cordifolium. 



Membrane of the anthers bilobate at tip 0, huiknse. 



Oxypetalum cordifolium (Vent.) Schlechter in Urban, Symb. Antill. 1:269. 1899 



(excl. syn. 0. riparium Kunth et sp. Antill.) Figures 18, 19, 20. 



A climbing, ligneous vine with erect, axillary, pubescent branchlets. 



Leaves opposite, rather variable in size, petiolate. 



Petioles slender, hairy, 2.5 to (i cm. long. Leaf 



blades broadly cordate-acuminate, 5 to 12 em. long, 



3 to 9 cm. broad, pahninerve; upper face sparsely 



1 ! ' hairy, lower face stiff-hairy and paler. 



llf\ F\JIA Inflorescence few-flowered, erect. Peduncles 



JUl / \ hairy, 5.7 cm. long; pedicels densely hairy, shorter 



\\ c than the petioles. Calyx divisions hairy, linear, 2 



"^J to 3 mm. long. Corolla claret-purple, hairy outside, 



Fig. ta.-Slamens of OxypeMum cor- smo °th inside, the lobes linear, about 18 to 27 mm. 



difoiium. a, From no. 10862, insti- ' on g, 2 mm. broad at the base, narrowing into an 



tuto Hs.-Keog. Costa Rica; 6, from acute apex. Leaflets of the corona 2.5 to 3.3 mm. 



UL l2 T' h u\ C[ li C '„ fr ,°"\ n °" lon g. exceeding the stamens, appendiculate, broadly 

 4000, Donnell Smith Herbarium. _ ... , , . , . 



a-c Scale 9. flabellale, or cuneale and rather narrow in their 



lower part and then with the tips obtusely pointed, 



subtrilobulate or distinctly trilobulate; appendage about 2 mm. long, shorter than the 



stamens. Stamens 2.8 mm. long, rather narrow, with an ovate-elliptic membrane 1 to 



1.5 mm. long and rounded at the tip. Retinaeles rather large, about 1.25 mm. long, 



the caudicles bearing a pair of laterally recurved hornlets; pollinia about 0.93 mm. 



long. Stigmatic head smooth, divided into two pointed branches about 3.5 mm. long. 



Follicles not known. 



« v b a' O 



Fig. 19.— Leaflets of corona of Oxypetalum cordifolium. a-c, Scale 9, 



Costa Rica: San Pedro de la ('alabaza, near Alajuela, altitude 1,100 meters; 

 Tonduz, flowers, October, 1896 (Instituto fis.-geog. Costa Rica no. 108ti2; U. S, Na- 

 tional Herbarium no. 5773(58); Atonas, on bushes along road, altitude 710 meters, 

 Piltier, flowers, April, 1898 (Instituto ffs.-geog. Costa Rica no. 12388; U. S. National 

 Herbarium 577583). 



Guatemala: Ojo de Agua, Departamento de Santa Rosa, altitude 1,170 meters, 

 Ileyde & Lux, flowers, September, 1892 (Donnell-Smilh Herbarium no. 4000; U. S. 

 National Herbarium no. 248281, distributed under the name of 0. riparium Kunth). 



