456 NATFIiAL HISTORY OF PLANTS. 



receptacle. Seed suberect ; hilum broad sessile; testa spongy; 

 albumen scanty ; radicle of erect embryo looking obliquely down- 



^vards. A small glanduhir pubescent shrub ; leaves 3-pinnatisect ; 



lobules glandular at apex ; stipules dentate, adnate to base of 

 j)ctiole ; tlowers cymose terminal. {Califomia.) See p. 369. 



2i). Purshia DC. — Flowers of Cotcania ; receptacle infundibuli- 

 form «dandular without, disciferous within. Sepals 5, imbricate. 

 Petals imbricate. Stamens 20-30 (of the Bosacece). Carpel 1 

 (of Chumcehalia). Fruit coriaceous, half immersed in receptacle. 

 Seed suberect ; albumen thin ; embryo straight ; radicle inferior. — 

 A bushy shrub; leaves alternate crowded, 3-fid or pinnatifid; 

 sti})ules adnate to petiole ; flowers axillary and terminal, subsessile. 

 {Rock 11 Mountains.) See p. 370. 



•1\. Cercocarpus ir. B. K. — Flowers apetalous; receptacle long 

 and llask-shaped ; neck linear very long and tubular, mouth broadly 

 dilated into a short cupule. Sepals 5, free or connate at base; 

 pnufloration valvate. Stamens 15-20 or co (of the RosacecB): 

 filaments free incurved in bud, inserted around thin cup lining 

 mouth of receptacle ; anthers short, often pubescent, dehiscing by 

 2 introrse clefts. Carpel 1, free, inserted in bottom of receptacle; 

 style terminal ; ovary 1 -celled; ovule 1, subbasilar ascending ana- 

 tru])ous ; micropyle inferior dorsal. Achene linear-oblong closely 

 enwrapped by base of receptacle, and passing into a very long 

 persistent plumose style carrying up with it the cupule and upper 

 ])art of receptacular tube, cut off' transversely in a circumcissile way. 

 Seed linear erect ; embryo fleshy exalbuminous ; cotyledons linear 

 superior ; radicle short inferior. — Small trees or shrubs ; leaves 

 alternate simple petiolate; stipules 2, lateral, adnate to base of 

 petiole; flowers solitary or more frequently very shortly spicate ; 

 a.xillary or terminal. {Mecvico, California.) See p. 370. 



22. Coleogyne Tokr. — Flowers hermaphrodite ; receptacle tubu- 

 lar, lined by a glandular disk. Sepals 4, 5, inserted in throat, 

 imbricate. Petals 0. Stamens oo (of PursJiia), inserted on both 

 receptiicle ard aii urceolate tube with ciliate rim produced above 

 ovary. Carprl 1 (of Ptirf^hia) ; style inserted at middle of 

 ventral angle of ovary ; ovule 1, incompletely anatropous descend- 



