Part 2, 1921] RUBIACEAE 103 



5. Bouvardia obovata H. B. K. Nov. Gen. & Sp. 3: 385. 1820. 



Stems herbaceous, erect, 6-10 dm. high, stout, simple below, sparsely branched above, 

 the branches stout, angulate, glabrous or puberulcnt at the nodes, the internodes elongate; 

 stipules short, cuspidate, pluriaristate; leaves 4— 5-verticillate, sessile or on petioles 6 mm. long 

 or shorter, the blades obovate or obovate-oblong, sometimes elliptic-oblong, 5.5-12.5 cm. long, 

 1.5-4 cm. wide, cuneate at the base, obtuse or acute at the apex, apiculate, thin, bright-green, 

 glabrous, sublustrous above, the lateral veins conspicuous; inflorescence terminal, cymose- 

 corymbose, 6-8 cm. broad, many-flowered, the pedicels stout, 1-4 mm. long; hypanthium 

 glabrous or minutely puberulent, 1.5-2 mm. long; calyx-lobes lance-triangular, 1.5-3 mm. 

 long, scabro-ciliolate; corolla red, papillose-puberulent outside, the tube 2.5-3.3 cm. long, 

 2.5-5 mm. thick above, sparsely villous within near the base, the lobes ovate-oval, 3-5 mm. 

 long, obtuse or acutish, erect or ascending; anthers subsessile, included, 3-3.5 mm. long; style 

 included or exserted; capsule subglobose, 7-9 mm. broad, bisulcate, glabrate; seeds dark- 

 brown, about 3 mm. broad, broadly winged. 



Type locality: Between Chapultepec and Texeoco, Mexico (state). 

 Distribution: Mountain slopes, Morelos and Mexico (state). 



6. Bouvardia glaberrima Engelm. in Wisliz. Tour Northern 



Mex. 106. 1848. 



Bouvardia ovata A. Grav, PI. Wright. 2: 67. 1853. 



Bouvardia triphylla A. Gray, Syn. Fl. N. Am. I 2 : 23, in part. 1884. Not B. triphylla Salisb. 1807. 



Erect shrub or sometimes herbaceous almost to the base, often much branched, the 



branches slender or stout, terete or subangulate, hirtellous or glabrate, the internodes short or 



elongate; stipule-sheath short, long-cuspidate or pluriaristate; leaves mostly ternate, the 



petioles slender or stout, 2-8 mm. long, the blades ovate, broadly ovate, ovate-oblong, or 



lanceolate, 2.5-10 cm. long, 0.7-2.5 cm. wide, acute or obtuse at the base, often abruptly short- 



decurrent, acute to attenuate at the apex, usually thin, bright- or pale-green, subconcolorous, 



scaberulous above or glabrate, beneath sparsely scaberulous or often glabrous, the lateral 



veins evident, 4-6 on each side, the margin usually plane; inflorescence terminal, cymose or 



cymose-corymbose, often subcapitate, usually few-flowered, the pedicels slender and often 



5-14 mm. long; hypanthium glabrous, scabrous, or hirsutulous, 1.5-2 mm. long; calyx-lobes 



triangular-lanceolate or linear, 2.5-9 mm. long; corolla red, puberulent or villosulous outside 



with short coarse hairs, the tube 2-3.2 cm. long, 2-3.5 mm. thick above, tapering from the 



top to base, glabrous within or sparsely villous, the hairs scattered, the lobes ovate-oval, 



2-3 mm. long, obtuse or acutish, erect or ascending; anthers usually subsessile and included, 



2.5-3 mm. long; style included or exserted; capsule subglobose, 5-7 mm. broad, bisulcate, 



usually almost wholly inferior; seeds dark-brown, 2-3 mm. long, broadly winged. 



TvrE locality: Cosihuiriachic, Chihuahua. 



Distribution: Southwestern New Mexico and southeastern Arizona, southward along the 

 mountains of Chihuahua, to Durango. 



7. Bouvardia scabrida Mart. & Gal. Bull. Acad. Brux. 

 II 1 : 237. 1844. 

 Bouvardia hypoleuca Benth. PI. Hartw. 288. 1848. 



Shrub, 1-6 dm. high, or sometimes herbaceous almost throughout, densely white-hir- 

 tellous when young, the internodes short or elongate; stipule-sheath short, long-cuspidate or 

 pluriaristate; leaves 3-4-verticillate, usually erect or ascending, sessile or on stout petioles 

 3 mm. long or shorter, the blades lanceolate to linear, 1.2-6.5 cm. long, 1-6.5 mm. wide, acute 

 at the base, acute to long-attenuate at the apex, thick, often rigid, bright-green above, very 

 scabrous, densely villous-tomentose beneath with coarse whitish hairs, the lateral veins mostly 

 obsolete, the margin usually strongly revolute; inflorescence terminal, cymose or cymose- 

 corymbose, usually few-flowered, often subcapitate, the pedicels stout, 3 mm. long or shorter; 

 hypanthium hirsutulous or very scabrous, 1.5-2 mm. long; calyx-lobes linear or linear-subulate, 

 1.5-5 mm. long; corolla red, puberulent or villosulous outside with short coarse thick hairs, 

 the tube 14-20 mm. long, 2.5-3 mm. thick above, tapering from top to base, with a densely 

 villous ring within near the base, the lobes ovate-oval, 2-2.5 mm. long, very obtuse to acutish, 



