158 Annals of the Carnegie Museum. 



(Materials and descriptions at hand do not permit a satisfactory 

 disposal in the key for the rest of the Crotons mentioned in the list.) 

 Filaments erect in the bud. 



(a) Calyx valvate in the staminate flowers; petals present or not. 

 Staminate flowers mostly apetalous; flowers in clusters, spikes, or 



panicles, axillary or terminal. 



Staminate flowers with petals 387. Caperonia palustris. 



Flowers without petals. 



Styles free or only slightly united at the base. 



Leaves entire, stipules deciduous; stamens 12-15. 



386. A delta Ricinella. 

 Leaves usually serrate with permanent stipules; stamens 



usually 8 388. Acalypha chama dry folia. 



Stigma practically sessile, large and disk-like, lobed. 



389. Per a opposilifolia. 



(b) Calyx valvate or almost imbricate; staminate flowers with petals; 



stamens usually 10 (Jatropha). 

 Petals free or slightly cohering at the base. 



Petioles about as long as the leaf-blade; stipules persisting. 

 Petioles bearing glands on branched stalks. 



390. Jatropha gossypifoUa. 

 Petioles without such glands 395. Jatropha tnultifida. 



Petioles very much shorter than the leaf-blades; stipules not 

 persisting. 

 Leaves distinctly petiolate; oblong or obovate; partly with 

 one or two acuminate basal lobes. 



391. Jatropha glaucovirens. 

 Leaves linear to oblanceolate, not lobed, scarcely petioled. 



{Jatropha angustifolia.) 



Leaves linear 393. Var. genuina. 



Leaves oblanceolate 392. Var. glauca. 



Petals cohering about half way; leaves broad and angularly lobed. 



394. Jatropha Curcas. 



(c) Calyx valvate; stamens free; staminate flowers without petals; 

 woody plants with large tuberous roots 396. Manihot Manihot. 



(d) Calyx imbricate; staminate flowers always without petals; flowers 



in terminal or axillary spikes, glomerate. 

 Shrub with shining, leathery, laurel-like, lance-oblong leaves. 



399. Gymnanthes lucida. 

 Low pubescent herb with small, lance-ovate leaves. 



398. Sebastiana corniculata. 

 Large tree with rounded-cordate acuminate leaves. 



397. Hura crepitans. 

 Flowers in involucres; calyx represented by a minute scale at the base of a filament- 

 like pedicel. 

 Glands of the involucre with petal-like appendages, often very much reduced; 

 leaves inequilateral, oblique at the base {Chamcesyce). 



