424 NATURAL HISTORY OF PLANTS. 



inwardly jnarginal ; cotyledons of straight exalbuminous embryo 

 broad transversely elliptical ; radicle sbort conical interior. — Trees, 

 bark suberose ; leaves alternate, abruptly pinnate ; leaflets entire 

 emarginate ; flowers in fall laxly composite cymiferous racemes ; 

 pedicels slender. (Brazil^.) 



Y. ^SCULE^. 



67. ^sculus L. — Flowers polygamous irregular ; lobes of gamo- 

 phyllous tubular calyx 5, unequal, imbricate. Petals 5, or, tbe 

 fifth place vacant, 4, unequal unguiculate ; claw linear, compressed 

 or canaliculate; limb inappendiculate, imbricate. Stamens 5-8, 

 subcentric ; filaments free, interior to annular or 1 -lateral disk sub- 

 bypogynous, erect or arcuately declinate ; a;nthers introrse, 2-rimose. 

 Germen (in male flower rudimentary) subcentric sessile, 3-locular; 

 style terminal elongate, apex stigmatose simple ; ovules in cells 

 2, inserted in the internal angle; one ascendent ; raphe ventral ; the 

 other descendent ; raphe dorsal. Fruit capsular, 3-locular, smooth 

 or more rarely echinate, coriaceous, globose or sub-3-lobed, loculici- 

 dal ; cells 1-3, 1-2-spermous ; seeds subglobose ; hUum large ; testa 

 smooth coriaceous exarillate; cotyledons of exalbuminous embryo 

 thickly fleshy hemispherical conferruminate ; radicle arched more or 

 less sheathed within the testa. — Trees or shrubs ; leaves opposite 

 exstipulate digitately composite ; leaflets serrate ; flowers in terminal 

 more or less eflongate branched cymiferous racemes; cymes often 1- 

 parous. [Temperate North America^ temperate Asia, Malays). See 

 p. 367. 



68 ? Billia Pete. — Flowers polygamous (nearly oi j^sculus); sepals 

 5, sub-free, approximating to a tube, imbricate. Petals 4, 5, un- 

 guiculate, incrassate within to base of limb esquamate or appendicu- 

 late with 2-lobed scale. Disk excentric, 1 -lateral. — Trees; leaves 

 opposite exstipulate digitately composite, oftener 3-foliolate ; in- 

 florescence, etc., of ^sculus. (Mexico, Columbia). See p. 369. 



1 Spec. 2. Walp. Sep. i. 422. 



