Part 2, 1921] 



RUBIACEAE 



101 



Corolla-tube glabrous within; leaves 2-3.5 mm. wide. 

 Corolla-tube more or less villous within; leaf-blades 5 mm. 

 wide or wider. 

 Hypanthium densely puberulent or short-hirtellous; 

 calyx-lobes 2-4.5 mm. long; inflorescences mostly 

 3 -flowered. 

 Hypanthium glabrous or very sparsely villous or pu- 

 berulent; calyx-lobes 4-11 mm. long; inflores- 

 cences mostly with 5 or more flowers. 

 Corolla 1.3-1.5 cm. long. 

 Corolla 2.5-4 cm. long. 



Pedicels 3 mm. long or shorter; leaves pale be- 

 neath, the lateral veins mostly obsolete. 

 Pedicels 6-28 mm. long; leaves subconcolorous, 

 the lateral veins evident. 

 Corolla white or greenish-white. 

 Corolla densely villous outside. 

 Corolla glabrous outside. 



Corolla-tube 2.4—3.3 cm. long. 

 Corolla-tube 1-2 cm. long. 



Leaf -blades, at least part of them, suhorbicular, 

 abruptly long- or short-acuminate; pedicels 2-8 mm. 

 long; corolla-tube 1.8-2 cm. long. 

 Leaf-blades mostly ovate or lanceolate, not abruptly 

 acuminate; pedicels 3 mm. long or shorter; corolla- 

 tube 1-1.5 cm. long. 

 Inflorescences many-flowered, compound; corolla-tube 6-11 mm. 

 long; leaves sometimes palmately nerved. 

 Leaves 3-5-nerved from the base. 



Hypanthium, calyx, and corolla hirtellous. 

 Hypanthium, calyx, and corolla glabrous. 

 Leaves pinnately nerved; corolla (so far as known) glabrous. 

 Leaves puberulent beneath along the veins; calyx-lobes 1-1.5 



mm. long. 

 Leaves glabrous; calyx-lobes 2.5-3.5 mm. long. 

 Corolla-lobes mostly 7-25 mm. long, of an oblong or elliptic type, spread- 

 ing, narrowed at the base; corolla white, the tube often 4 cm. long 

 or longer. 

 Leaves sessile, the blades broadly ovate; calyx-tube developed. 

 Leaves petiolate; calyx-tube obsolete. 

 Corolla more or less villous outside. 

 Corolla densely villous outside. 

 Corolla villous only on the upper part of the tube. 

 Corolla glabrous outside or pruinose-puberulent. 



Leaf-blades linear or lanceolate, 1.5-4 mm. wide; corolla 



pruinose-puberulent . 

 Leaf -blades mostly ovate or broadly ovate, more than 5 mm. 

 wide; corolla glabrous. 

 Corolla-tube 1.5-3.5 cm. long. 



Calyx-lobes foliaceous, 4-12 mm. long, mostly elliptic 



or oblanceolate. 

 Calyx-lobes lance-triangtdar, 1-1.5 mm. long. 

 Corolla-tube 4-8.5 cm. long. 



1 1. B. macilenta. 



12. B. versicolor. 



13. B. Conzattii. 



14. B. chrysanlha. 



15. B. laevis. 



16. B. lillosa. 



17. B. macrantha. 



18. B. heterophylla. 



19. B. multiflora. 



20. B. quinqnenen^ta. 



21. B. Rekoi. 



22. B. gracilipes. 



23. B. dirtyoneura. 



24. B. Rosei. 



25. B. induta. 



26. B. Langlassei. 



27. B. erecta. 



28. B. glabra. 



29. B. latifolia. 



30. B. longiflora. 



1. Bouvardia leiantha Benth. PI. Hartw. 85. 1841. 



Bouvardia corymbosa Oerst. Vidensk. Meddel. 1852: 46. 1852. 



Branches stout, terete, brownish or grayish, densely puberulent and villosulous when 

 young; stipule-sheath 5 mm. long or shorter, long-cuspidate, sometimes glandular-dentate; 

 leaves 3-4-verticillate or opposite, sessile or subsessile, the lowest sometimes with petioles 

 3 mm. long, the blades ovate, broadly ovate, or ovate-oblong, 3-7 cm. long, 1.3-3 cm. wide, 

 rounded at the base, acute or subabruptly acuminate or attenuate at the apex, thin, bright- 

 green above, scaberulous or villosulous, short- villous beneath or densely whitish-tomentose ; 

 inflorescence usually terminal, cymose-corymbose, densely many-flowered, 4-9 cm. broad, 

 the pedicels 1-4 mm. long; hypanthium hemispheric, 1.5 mm. long, hirsutulous or glabrate; 

 calyx-lobes lance-linear, 2-4 mm. long, ciliolate and often hirsutulous; corolla deep-red, glabrous 

 outside, the tube 12-16 mm. long, tapering from the top to the base, 2-2.5 mm. thick above, 

 with a villous ring within near the base, the lobes rounded-ovate, 2-3 mm. long, obtuse or 

 rounded at the apex, erect or ascending; anthers 1.5-2 mm. long, included or exserted, the 

 filaments short or elongate. 



Type locality: Near Tejar and Chimaltenango, Guatemala. 

 Distribution: Chiapas to Costa Rica. 



