f!08 NATURAL HISTORY OF PLANTS. 



GENERA. 



I. BIXE^E. 



1. Bixa L. — Flowers hermaphrodite regular; receptacle shortly 

 convex. Sepals 5, imbricated, and petals same in number, alternate, 

 contorto-imbricated, deciduous. Stamens go ; filaments inserted under 

 gynseceum, free or polyadelphous at base ; anthers extrorse, 2-locular, 

 induplicate at middle, at the same place dehiscing by short clefts 

 (falsely terminal). Germen free, 1-locular ; style elongated, in bud 

 recurved, tubular, apex stigmatiferous very obtuse 2-crenate ; pla- 

 centas parietal 2, but little prominent ; ovules in each co, 2- oo-seriate 

 ascending, anatropous ; micropyle extorse lateral and inferior. Fruit 

 capsular, densely echinate-setose or more rarely glabrous, laterally 

 2-valved ; valves thick seminiferous inwardly at middle ; endocarp 

 separating. Seeds co, obovoid ; apex of funicle dilated in small 

 2-lobed aril ; outer coat subfleshy suberose-granulate ; chalaza orbi- 

 cular, finally depressed ; albumen fleshy ; cotyledons of axile embryo 

 foliaceous wide, often incurved. — Small trees (abounding in red or 

 yellow juice) ; leaves alternate petiolate digitinerved ; stipules 2, 

 lateral, caducous ; flowers in terminal racemose cymes ; pedicels under 

 calyx often 5-glandular {Tropical America). See p. 273. 



2. Oncoba Forsk. 1 — Flowers polygamous, monoecious or dioecious. 

 Sepals 3-5, and petals same in number, of which 4—10 are larger, 

 esquamate ; all much imbricated in prsefloration. Stamens oo, in- 

 serted on more or less thickened receptacle ; filaments free ; anthers 

 linear, more rarely oblong or abbreviate, apex muticous or apiculate 

 with more or less produced connective ; cells extrorse longitudinally 

 rimose. Germen free, 1-locular; placentas parietal 2-10, co -ovulate ; 



1 Fl. JEg.-arab., 103 (1775).— J., Gen., 292.— Besler., 231 (nee DC, nee Puer.).— Beptaca 



Poir., Dict.,vi. 210; III., t. 471. — Spach, Suit. Lour., Fl. Coch., ed. ulyssip. (1790), 657.— 



a Buff on, vi. 115.— Endl., Gen., n. 5067. — Pi., Ventenatia Pal. Beatjv., FL Ow. et Ben., i. 



in Hook. Bond. Journ., v. 295. — Payer, Fam. 29, t. 17 (nee Sm.).~ Cambess., in Mem. Mux., 



Nat., 111. — Benth., in Journ. Linn. Soc, v. xvi. 409. — Endl., Gen., n. 5402. — Xylotheca 



Suppl., 80.— B. H., Gen., 125, 97l, n. 4.— Oliv., Hochst., in Flora (1843), 69.— Chlanis Kl., 



in Journ. Linn. Soc, is. 172.— H. Bn., in Adan- in Pet. Ifossamb., BoL, 144. 

 sonia, x. 249. — Lundia Schum. & Thonn., 



