30 | RUBIACEE. 
2. Houstonia bouvardioides, Benth. et Hook. Gen. Plant. ii. p. 60. 
Hedyotis bouvardioides, Seem. Bot. Voy. ‘ Herald,’ p. 296, t. 64. 
NortH Mexico, Sierra Madre (Seemann); GuaTEMALA, Volcan de Fuego, 6500 feet — 
(Salvin)? Hb. Kew. 
3. Houstonia cerulea, Linn. Sp. Pl. p. 152; Bot. Mag. t. 370. 
Hedyotis cerulea, Hook. Fl. Bor.-Am. i. p. 286. 
Canapa southward through the Eastern States.—MeExico, Orizaba (Botteri). Hb. 
Kew. | 
4, Houstonia humifusa, Hemsley. 
Hedyotis humifusa, A. Gray, Pl. Lindh. ii. p. 216. 
Trxas.—Nortu Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & 
Palmer, 301). Hb. Kew. 
5. Houstonia longiflora, A. Gray in Proc. Amer. Acad. iv. p. 314. 
Bouvardia longiflora, H. B. K. Nov. Gen. et Sp. iii. p. 386; Bot. Mag. t. 4223. 
Aiginetia longiflora, Cav. Ic. vi. t. 572. fig. 1. 
Norta Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 573) ; 
SoutH Mexico, Tehuacan and Morelia, at 7000 feet (Galeotti, 2637, 2652), San Felipe 
(Liebmann), near Oaxaca (Andrieux, 336), plain of Actopan (Hartweg), Santa Anita, 
&c., at 7000 feet (Humboldt & Bonpland), Chiapas (Ghiesbreght), without localities 
(Schaffner, Bates, Keerl, and others); Guaremata (Skinner); Costa Rica (Endres). 
Hb. Kew. | 
6. Houstonia purpurea, Linn. Sp. Pl. i. p. 105; Lodd. Bot. Cab. t. 1621; 
Torr. & Gray, Fl. N. Amer. ii. p. 40. 
PENNSYLVANIA to ILLINoIs and southward.—Muexico, without locality (Gregg, 66). 
Hb. Kew. 
7. Houstonia rubra, Cav. Ic. v. p. 48, t. 474. fig. 1. 
New Mexico; Texas.—Nortu Mexico, in the region of San Luis Potosi, 6000 to 
8000 feet (Parry & Palmer, 300); Sourn Mexico, Aguas Calientes (Hartweg), without 
localities (Coulter, 196 ; Halsted). Hb. Kew. 
8. Houstonia triflora, A. Gray in Proc. Amer. Acad. iv. p. 314. 
Bouvardia triflora, H. B. K. Nov. Gen. et Sp. iii. p. 386, t. 288. 
Anotis longifiora, Benth. Pl. Hartw. p. 23. 
South Mexico, near Puente de la Madre de Dios and the village of Atotonilco el 
Grande, at 5400 feet (Humboldt & Bonpland), Aguas Calientes (Zartweg), Zimapan 
(Coulter, 219). Hb. Kew. | 
