74 ROSACEA. (ROSE FAMILY.) 



glabrous above : flowers nodding or reflexed .• the upper petal smallest, marked 

 with reddish spots : pod 1 inch long, more or less lunate, scabrous, 2 to 3-seeded, 

 sprinkled (as well as the leaves, calyx, and petals) with sessile black glands. — Fl. i. 

 393. Plains of E. Colorado, New Mexico, and Texas. 



2. H. drepanooarpa, Gray. Minutely cinereous-puberulent, wholly desti- 

 tute of glands: stems numerous, from a, thick woody root: pinnae 5 to 11, 

 8 to 20-foliolate ; leaflets crowded, subfalcate, nerveless : petals broadly obovate, 

 nearly alike, naked and glabrous : pod 1 ^ to 2 inches long, strongly falcate, gla- 

 brous or minutely puberulent under a lens, 9 to 10-seeded. — PI. Wright, i. 58. 

 Colorado, New Mexico, and Arizona. 



20. SCHEAUKIA, Willd. Sensitive Briar. 



Flowers polygamous. Calyx minute, 5-toothed. Pod long and narrow, 

 4-valved. — Perennial herbs, the procumbent stems and petioles prickly : lea/es 

 sensitive and of many small leaflets, the axillary peduncles bearing round 

 heads of small rose-colored flowers. 



1. S. uncinata, Willd. Prickles hooked: partial petioles 4 to 6 pairs: 

 leaflets elliptical, reticulated with strong veins beneath : pod oblong-linear, 

 nearly terete. — Throughout the S. E. States and westward across the plains 

 to Colorado and the Dakotas. 



Order 26. ROSACEA. (Rose Family.) 



Herbs, shrubs, or trees, with mostly alternate leaves, usually evident 

 stipules, usually perigyuous mostly numerous stamens, distinct free 

 pistils from one to many, or coherent with each other and the calyx- 

 tube, and anatropous seeds destitute of albumen or nearly so. 



Suborder I. AMYGDAlCEiE. 



Carpels solitary, or rarely 5, becoming drupes, entirely free from the 

 calyx, this or its lobes deciduous. Ovules 2, pendulous, but seed almost 

 always solitary. Style terminal. — Trees or shrubs, with bark exuding 

 gum, and mostly (as well as the seeds) yielding the flavor of prussic 

 acid. Stipules free, deciduous. 



1. Prunus. Flowers perfect. Carpel solitary. 



Suborder II. ROSACEA proper. 



Carpels free from the persistent ealyx, becoming akenes, or follicles, 

 or drupe-like in fruit. Stipules commonly adnate to the petiole. Calyx 

 dry and open, or sometimes strictly enclosing the fruit, or fleshy and 

 pome-bike. 



Tribe I. SPIR-SEACE-Sl. Carpels few, rarely solitary, becoming two to several-seeded 

 follicles. Calyx open. 



# Carpels alternate with the calyx-lobes when of the same number. 

 •*- Seeds with membranous testa and no albumen : stipules none. 



