STANDLEY — TREES AND SHRUBS OF MEXICO. 795 



gamosepalous, usually 5-parted ; petals 5 or none, free or united with the 

 stamen tube; stamens connate, at least at base, the tube usually with 5 

 staminodia, the anthers borne in the sinuses ; fruit dry or rarely baccate, 

 usually 5-celled, variously dehiscent. 



The genus Brotera Cav. was originally described from Mexico, but incor- 

 rectly, or else it was based upon a cultivated plant. The name is considered 

 a synonym of Melhania Forsk. and the species described by Cavanilles is an 

 African one. 



Flowers unisexual ; fruit of distinct carpels ; leaves simple and deeply lobed or 

 often compound 1. STERCULIA. 



Flowers perfect ; fruit not of distinct carpels ; leaves simple, rarely lobed. 

 Petals none. Leaves lobed. 



Flowers zygomorphic; anthers sessile 2. CHIRANTHODENDRON. 



Flowers regular ; anthers on long filaments 3. rBEMONTODENDRON. 



Petals present. 



Androgynophore very long, in age equaling or longer than the fruit ; carpels 



often spirally twisted 4. HELICTERES. 



Androgynophore short, always shorter than the fruit ; carpels never 

 twisted. ' 



Petals flat ; anthers 5. 



Seeds numerous in each cell 5. HERMANNIA. 



Seeds 2 in each cell or, by abortion, only 1. 



Capsule 1-celled 6. WALTHERIA. 



Capsule 5-celled. - j • 



Staminodia present; calyx in fruit 1.5 to 4 cm. long.'- ' A^ *"<*a-*-w.. 

 Staminodia none ; calyx in fruit 1 cm. long or less. ^ 



8.MEL0CHIA. 

 Petals concave or cucullate ; anthers 5 to 15. 

 Anthers 2 or more in each sinus of the stamen tube. 



Blade of the petal entire ; fruit not muricate 9. THEOBROMA. 



Blade of the petal deeply bifid; fruit muricate 10. GUAZT7MA. 



Anthers 1 in each sinus. 



Petals free from the stamen tube 11. NEPHROPETAXTJM. 



Petals united at the apex with the stamen tube. 



Petals naked on the back or furnished with a gland; plants un- 

 armed, never scandent 12. AYENIA. 



Petals produced dorsally into a ligulate blade ; plants often prickly 

 and scandent 13. BTJETTNERIA. 



1. STERCULIA L. Sp. PI. 1007. 1753. 



Trees ; leaves simple and lobate or digitately compound ; flowers unisexual 

 or polygamous, paniculate, usually axillary ; calyx 5-lobate, commonly colored 

 and corolla-like ; petals none ; stamen column with usually 15 anthers at the 

 apex ; fruit 5-carpellate, the carpels distinct, spreading, woody, dehiscent along 

 the inner side ; seeds 1 to many in each carpel, large. 



Leaves simple, palmately lobed 1. S. apetala. 



Leaves digitately compound 2. S. mezicana. 



1. Sterculia apetala (Jacq.) Karst. Fl. Columb. 2: 35. 1869. 

 Helicteres apetala Jacq. Stirp. Amer. 238. pi. 181. 1763. 

 Sterculia carthaginensis Cav. Monad. Diss. 3.53. 1790. 

 Sterculia punctata DC. Prodr. 1: 483. 1824. 

 Chichaea acerifolia Presl, Rel. Haenk. 2: 141. 1836. 

 Sterculia acerifolia Hemsl. Biol. Centr. Amer. Bot. 1: 126. 1879. 



