320 PROCEEDINGS OF THE AMERICAN ACADEMY. 



quadrangular, glabrous : leaves opposite, thin, ovate to ovate-lanceolate, 

 acute, attenuate at the base, covered on both surfaces with a sparse 

 more or less deciduous pubescence and resinous( ?) puuctation, ciliolate 

 at least when young, sharply serrate; petioles 2 mm. long; blade about 

 2 era. long, half as broad : floriferous branches leafy-bracted ; bracts 

 somewhat obovate, cuneate at the base ; peduncles 2-flowered ; pedicels 

 slender, 4 mm. in length : calyx herbaceous, 6 mm. long, divided nearly 

 to the base ; segments oblong-lanceolate, gradually and evenly narrowed 

 almost from the base to the flat acute but not at all subulate tip : corolla 

 scarlet, 2.4 cm. long, extei'nally glabrous, internally pubescent near the 

 base and bearded along a ventral line ; lobes orbicular, sj^reading : cap- 

 sule ovate, stramineous, 6 mm. long. — R. sarmentosa, Gray in Wats. 

 Proc. Am. Acad. xxi. 434, not Jacq. — Collected in Jalisco in barrancas 

 near Guadalajara by Dr. Edward Palmer, June, 1886, no. 126, and 

 by C. G. Priiigle, June, 1889, no. 2568. Types in herb. Gray. This 

 species differs from any other known to the author in the shape of its 

 calyx-lobes. 



++ -M- ++ Leaves serrate : calyx-lobes broadly ovate, acuminate to subulate tips. 



^= Stems and branches chiefly 4-angled, glabrous or glabrate. 



a. Leaves not cordate. 



5. R. SARMENTOSA, Jacq. Enum. PI. Carib. 25 (1762) nomen, Stirp. 

 Select. Am. 178 (1763), t. 113. 



h. Leaves cordate. 



6. R. FLORiBUNDA, HBK. Nov. Gen. & Spec. ii. 359 (1817). 

 Doubtless represented by Palmer's no. 252 from near Acapulco. 



7. R. SYRiNGAEFOLiA, Cham. & Schlecht. Linnaea, vi. 376 (1831). 



= = Stems and branches 6-many-angled. 

 a. Stems glabrous or soon glabrate. 



8. R. VERTiciLLATA, HBK. Nov. Gen. & Spec. ii. 360 (1817). 



h. Stems tomentulose or pubescent. 



1. Leaves small. 



9. R. POLTEDRA, Zucc. Abh. Akad. Muench. ii. 328 (1832-36). 

 R. retrorsa, Greene, Pittonia, i. 176, is hardly distinct. 



2. Leaves large. 



10. R. TERNiFOLiA, HBK. Nov. Gen. & Spec. ii. 359 (1817). 



