RUBIACEA. 31 
_ 9, Houstonia, sp. 
SoutH Muxtco, Vera Cruz to Orizaba (Miller, 1342). Hb. Kew. 
10. Houstonia, sp. 
Soutn Mexico, Jalapa (Coulter, 194). Hb. Kew. 
24. MALLOSTOMA. 
Mallostoma, Karst. Fl. Colomb. ii. p. 9, t. 105 ; Benth. et Hook. Gen. Plant. ii. p. 60. 
About twenty species of shrubs and undershrubs, inhabiting the mountains of 
America from Texas to Peru. 
1. Mallostoma acerosa, Hemsley. 
Hedyotis (Ereicotis) acerosa, A. Gray, Pl. Wright. i. p. 81. 
*  Tuxas.—NortH Muxico, Buena Vista (Gregg, 72), region of San Luis Potosi, 6000 to 
8000 feet (Parry & Palmer, 302). Hb. Kew. 
2. Mallostoma, sp. 
SourH Mexico, Ciudad Real (Linden, 539). Hb. Kew. 
‘Tribe VIL. MUSSHNDES. 
Mussendee, Benth. et Hook. Gen. Plant. 1. pp. 8, 15. 
There are thirty-six genera of this tribe, generally dispersed in tropical countries. 
The species are shrubby or arboreous, rarely herbaceous. 
| 25. ISERTIA. 
Isertia, Schreb. Gen. Plant. p. 234; Benth. et Hook. Gen. Plant. ii. p. 65. 
Fifteen or more shrubby and arboreous species, inhabiting Tropical America from 
Mexico (?) and Central America, through Colombia and Guiana, to Brazil. 
1. Isertia henkeana, DC. Prodr. iv. p. 437. 
Mexico (Henke). 
9. Isertia spiceformis, DC. Prodr. iv. p. 437. 
Panama, outskirts of woods near the city of Panama (Seemann, 352; S. Hayes, 
557).—Cotomsia. Hb. Kew. 
26. GONZALEA. 
Gonzalea, Pers. Syn. i. p. 182; Benth. et Hook. Gen. Plant. 1. p. 65. 
Gonzalagunia, Ruiz et Pav. Prody p. 12, t. 3; Fl. Peruv. i. p. 56, t. 86. 
About a dozen shrubby species, restricted to Tropical America. 
