AND STERCULIACE X. 111 
Bombaceæ already absorbed in Malvacez, we have a more definite 
group,—closely allied, it is true, to Malvacez, but readily separated 
by their two-celled anthers; and differing rather more from Tili- 
acee in habit, in their stamens either prominently monadelphous 
or definite either singly or in fascicles alternating with the sepals. 
In the few cases where genera with shortly monadelphous stamens 
have been admitted into Tiliacew, they may be known by their 
pendulous ovules with a ventral raphe, a character very frequent in 
Tiliacez, but, as I believe, unknown in Malvacee or Sterculiacez. 
At the same time, the large order of Sterculiacee thus formed, 
consisting of 41 genera and between 500 and 600 species, may be 
divided into the following seven distinct, well-marked, and for the 
most part natural tribes. 
Tribus I. SrERcvLigx. Flores unisexuales v. polygami. Calyx 
sepe coloratus. Petala 0. Anthere 5-15 ad apicem columns 
congestze, brevissime 5-adelphe v. annulate. Carpella fructus 
libera. 
* Anthere inordinate congeste. | Semina albuminosa. 
Genera:—1. Sterculia, Linn. (Triphaca, Lour.; Ivira, Aubl. ; 
Southwellia, Salisb.; Chichea, Presl, v. Mateatia, Vell.; Ca- 
vallium, Schott; Firmiana, Marsigl.; Erythropsis, Lindl. ; 
Brachychiton, Schott; Pecilodermis, Schott; Trichosiphon, 
Schott; Delabechea, Lindl.; Pterygota, Schott ; Hildegardia, 
Schott; Scaphium, Schott; Pterocymbium, R. Br.) ; 2. Tar- 
rietia, Blume (Argyrodendron, F. Müll.). 
** Anthere uniseriatim annulatæ. Albumen 0. 
Genera:—3. Cola, Schott (Courtenia, R. Br.); 4. Heritiera, 
Ait.; 5.? Tetradia, R. Br. 
Tribus II. HzrrorERE. Flores hermaphroditi. Petala 5, deci- 
dua, Antheræ 5-15 ad apicem columne elongate sessiles v. 
stipitatæ, per 1-3 cum dentibus columnæ (raro obsoletis) v. 
staminodiis 5 linearibus v. ligulatis extrorsum alternantes. 
Cotyledones integræ. 
* Ovarium intra basin columne sessile. Anthere sessiles. 
Genus :—6. Myrodia, Schreb. (Lexarza, Llav.). 
** Ovarium gynophoro columna adnato fultum. Anthere sessiles. 
Calyx clavato-campanulatus. 
Genera:—7. Reevesia, Lindl.; 8. Ungeria, Endl. 
