158 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



1. Macuillamia limosa Pennell, sp. nov. 



Extensively repent. Stem slightly succulent, finely pubescent 

 rather densely so distally. Leaves 1.2-1.7 cm. long, 8-10 mm. wide 

 obovate-elliptic, entire, narrowed at base, rounded at apex, with 

 7 or 9 longitudinal veins. Pedicels slender, 10-15 mm. long, finely 

 pubescent, in flower ascending, soon reflexing below the leaf-like 

 bracts. Sepals 2.5-3 mm. long, obtuse, somewhat pubescent; two 

 outer ovate-oblong; two median lanceolate-oblong; the innermost 

 one narrower or wanting. Corolla 4 mm. long, the lobes spreading, 

 slightly longer than the tube, the two posterior united to apex; 

 glabrous throughout, white. Filaments white. Anthers purplish. 

 Styles distinct near apex; stigmas semi -capitate. Capsule 2-2.5 

 mm. long, nearly globose, obtuse. Seeds .6 mm. long, cylindric- 

 oblong, reticulate, brown. 



Type, open pool in clayey loam, Melgar, Cundinamarca, altitude 

 400-500 meters, collected in flower and fruit December 4-5, 1917, 

 F. W. Pennell 2927; in Herb. New York Botanical Garden. 



Open pools and ditches, in shallow still water, at altitudes below 

 500 meters, Tropical zone, in the Magdalena and Cauca valleys, 

 and doubtless through northern Colombia. Ranges northward to 

 Mexico. 



Antioquia. Puerto Berrio (shallow water, alt. 125-135 m.), 

 Rusby & Pennell 32. 



Cundinamarca. Melgar (pool in clayey loam, alt. 400-500 m.), 

 Pennell 2927. 



Tolima. Espinal to Cuamo (ditch, loam, alt. 350-400 m.), Rusby 

 & Pennell 179. 



Valle. La Paila, I. F. Holton 581 (H, Y). ■ 



8. HYDRANTHELIUM Humboldt, Bonpland and Kunth. 

 Hydranthelium H. B. K., Nov. Gen. et Sp. 7: 202. pi. 646. 1825. 

 Type species, H. callitrichoides H. B. K., of Venezuela. 



1. Hydranthelium braunii Ernst. 



Hydranthelium braunii Ernst, in Vargasia 1: 189. 1870. 

 "Halle el 19 de Setiembre de 1869 en uno de los pozos de la sabana delante 

 el camposanto de la Merced [Caracas]," Venezuela. 



Open wet soil, at an altitude of 30 meters, Tropical zone, in Mag- 

 dalena; doubtless eastward near the Caribbean coast through Vene- 

 zuela. 



Magdalena. El Libano plantation, (Santa Marta region, open 

 land on border of swamp and flooded during heavy rains, alt. 30 m.), 



