456 NATURAL HISTORY OF PLANTS. 



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

 albumen scanty; radicle of erect embryo looking obliquely down- 

 wards. — A small glandular pubescent shrub ; leaves 3-pinnatisect ; 

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

 petiole ; flowers cymose terminal. {California.) See p. 369. 



20. Purshia DC. — Flowers of Cowania ; receptacle infundibuli- 

 form, glandular without, disciferous within. Sepals 5, imbricate. 

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

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

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

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

 stipules adnate to petiole ; flowers axillary and terminal, subsessile. 

 {Bochy Mountains.) See p. 370. 



21. Cercocarpus H. B. K. — Flowers apetalous; receptacle long 

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

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

 prsefloration valvate. Stamens 1 5-20 or go (of the Rosacea) : 

 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- 

 tropous ; micropyle inferior dorsal. Acliene 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 

 part 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 ; 

 axillary or terminal. {Mexico, California.) See p. 370. 



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

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

 imbricate. Petals 0. Stamens go (of Purshia), inserted on both 

 receptacle and an urccolatc tube with ciliate rim produced above 

 ovary. Carpel 1 (of P'/rs/ila) ; style inserted at middle of 

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



