140 TREES AND SHRUBS 



funnelform; 2-lipped; deciduous; stamens 5, 1 or 3 reduced to sterile 

 filaments or 4 and then didynamous; filaments filiform, adnate to 

 the corolla tube, included anther sacs, divaricate; ovary 1-celled 

 with 2 parietal placentae or 2-celled by a false partition; style 1, 

 stigmas 2; fruit a slender, terete coriaceous capsule with numerous 

 winged seeds. 



Leaves simple; flowers purplish. 1. Chilopsis. 



Leaves compound; flowers yellow. 2. Stenolobium. 



I. CHILOPSIS Don. Desert Willow. 



Large shrub, sometimes tree-like, 6 to 15 feet high, branched 

 from the base, with narrow, lanceolate, thin, light green leaves and 

 terminal racemes or thyrsoid panicles of showy, purplish flowers; 

 calyx membranaceous splitting into 2 concave lobes; corolla about 

 1 inch long, funnelform, obscurely 2-lipped, the limb narrow, upper 

 lip 2-lobed, the lower 3-lobed; anther bearing stamen? 4 with a stami- 

 nodium adnate to the base of the corolla tube; capsule tapering at 

 both ends, terete, 1 dm. long or more; seeds numerous. 



1. C. linearis. 



ACANTHACEAE. Acanthus Family. 



Annual or perennial herbs or shrubs, with enlarged nodes, 

 alternate opposite or whorled. exstipulate leaves, and perfect irregu- 

 lar flowers often subtended by conspicuous bract; calyx of 5 sepals, 

 nearly distinct or often united, sometimes with bractlets subtending. 

 Corolla of 5-partially united petals. 2-lipped or sometimes nearly 

 regularlv 5-'.obed; stamens 4. didynamous. or 2: ovary superior 2- 

 celled; style single: stigma entire or 2-lobed: fruit a capsule. 2- 

 celled: valves elastic, seeds usually flattened. 



Leaves linear; corolla 10 mm. long or less, pale Carlowrightia . 



oiue. 

 Leaves lanceolate; corolla 30 mm. long, pink- |wtb A canthUB 



ish or red. 



I. CARLOWRIGHTIA A. Gray. 



Much branched shrub, 3 feet high or less, with slender stem*, 

 (those of the year green), and opposite, linear to filiform leaves 

 % to I 1 -.- inches long; Dowers perfect, at first axillary, then panicu- 



