1920.] NATURAL SCIENCES OF PHILADELPHIA. 155 



2600-2700 m.) Pennell 2158; Sibate (wet loam, alt. 2700-2800 m.), 

 Pennell 2451; Ubaque (wet ditfch, edge of paramo, alt. 3000-3200 

 m.), Pennell 1902; Zipaquira (Mt. Aquila, edge of pool, just below 

 paramo, alt. 3100 m.), Pennell 2532. 



Nariiio. Tuquerres (alt. 3000 m.), Triana (H, Y). 



Tolima. IMurillo (pool, alt. 2600-2800 m.), Pennell 3155. 



6. MONOCARDIA'5 Pennell, gen. nov. 



Stems much branched, terete, repent, the apices ascending. 

 Leaves sessile, slightly clasping, oblong to orbicular, entire, pal- 

 mately-veined from base, obscurely glandular-dotted and not odor- 

 ous. Pedicels axillary, 6 20 mm. long, pubescent, not bracteolate. 

 Caljrx of 5 very dissimilar sepals; outermost (posterior) heart- 

 shaped; two antero-latei'als smaller, obliquely, or but one-half cor- 

 date- or truncate-ovate, three outei- prominently reticulate; two pos- 

 tero-laterals (innermost) linear-attenuate, only % length of outer- 

 most and usually slightly longer than the capsule. Corolla 3-7 

 mm. long, the widely-spreading lobes longer than the tube, the two 

 posterior lobes united nearly throughout; glabrous throughout, blue 

 or white. Stamens four, glabrous, didynamous (the posterior fila- 

 ments shorter and usually anthers smaller) ; anthers uniform, the 

 narrow sacs closely connivent, each opening its entire length. Style 

 glabrous, httie exceeding the sepals. Stigmas distinct, flat. Cap- 

 sule 2-4 mm. long, much shorter than calyx, oblong or ovoid-oblong, 

 acute, brown, septicidal and loculicidal; the septum with adherent 

 thin placentae, persisting plate-like. Seeds .2-.3 mm. long, oblong, 

 blackish-brown, ridged and with cross-reticulations. 



Type species, M. violacea Pennell. 



Hydrotrida Small, in general aspect like this genus, differs in pos- 

 sessing a circle of bristles surrounding the ovary, pubescence within 

 over the bases of the corolla -lobes, two bracteoles below the calj^x, 

 and more conspicuous glands which exhale a strong aromatic odor. 



Pedicels and sepals with spreading hairs. Stems and leaves beneath 



pubescent. Corolla blue. 



Corolla 6-7 mm. long. Calyx 5-7 mm. long. Leaves 1.2-1.8 



cm. long, and nearly as wide. Stems densely hirsute, 2-3 



dm. long. 1. M. violacea. 



Corolla 4-5 mm. long. Calyx 4-6 mm. long. Leaves .7-1.8 cm. 



long, ovate-oblong. Stems pubescent, less than 1.5 dm. 



long. 



^Name from (xovoq, one, and KapBta, heart, in allusion to the single large cor- 

 date sepal. 



