DICOTYLEDONOUS PLANTS 127 



Flowers blue or purple. Calyx-teeth short, nearly equal, downy. 

 Pod glandular. Kiver banks.* 



XVI. WISTARIA, Nutt. 



Tall, twining shrubs. Leaves odd-pinnate. Eacemes ter- 

 minal. Flowers large and showy. Calyx 2-lipped, the upper 

 lip 2-cleft, short, the lower longer and 3-cleft. Standard 

 large, round, with 2 calloused ridges at the base, wings 

 eared at the base, keel scythe-shaped. Pod long, stalked, 

 leathery, 2-valved, several-seeded.* 



1. W. frutescens, Polr. Wistaria. Stem climbing 30-40 ft., 

 often 2-3 in. in diameter at the base ; branches and leaves downy 

 when young, becoming smoother with age. Leaves short-petioled ; 

 stipules niinute; leaflets 9-17, ovate-lanceolate, acute at the apex, 

 rounded at the base. Racemes large, densely flowered. Calyx 

 downy. Corolla Ulac-purple, one wing with a slaort and one with a 

 long appendage at the base. Pod 2-3 in. long, 2-4-Beeded. River 

 banks S. Often cultivated for ornament.* 



2. W. chinensis, DC. Chinese Wistaria. Larger and faster 

 growing than No. 1. Racemes longer and more slender. Wing- 

 appendages equal. Seldom fruiting in this region. Cultivated from 

 China or Japan. 



XVn. ROBIWIA, L. 



Trees or shrubs. Leaves odd-pinnate ; stipules often spiny. 

 Flowers showy, in axillary racemes. Calyx short, 5-toothed, 

 the two upper teeth shorter and partially united. Standard 

 large, orbicular, reflexed, keel obtuse. Stamens diadelphous. 

 Style bearded on one side. Pod compressed, several-seeded.* 



1. R. Pseudacacia, L. Black Locust. A tree of medium size; 

 bark rough and nearly black ; twigs and leaves smooth. Leaflets 

 9-15, ovate or oblong, obtuse and slightly mucronate at the apex; 

 stipules forming persistent spines. Racemes loose, pendulous, 3-5 in. 

 long. Flowers white, fragrant. Pod smooth, i-S-seeded. Intro- 

 duced and quite common ; wood very durable when exposed to the 

 weather, and extensively used for posts.* 



XVni. ASTRAGALUS, Toum. 



Mostly perennial herbs. Leaves odd-pinnate. Flowers in 

 spikes or racemes. Calyx 6-toothed. Petals long, erect, with 



