134 American Midland Naturalist Monograph No. 7 



20. Tephrosia Pers. — Goat's-rue 

 T. virginiana (L.) Pers. Dry sandy soil. June-July. \T. virginiana 

 var. holosericea (Nutt.) T. & G.]. 



21. Robinia L. — Locust 

 l.Tree to 25 m tall; twigs and petioles glabrous; flowers white, in 

 pendulous racemes; commonly cultivated and abundantly nat- 

 uralized in 111.; native along the Ohio R., in southeastern 111., 



and eastward. May-June. Black Locust R. pseudoacacia L. 



1. Shrubs to 9 feet tall; stem viscid or bristly; flowers pink or rose. 

 2. Stems bristly with stiff" hairs; planted and sometimes persisting 

 or spontaneous; native of southeastern U.S. May-June. 



Bristly Locust. Rose Acacia R. hispida L. 



2. Stems viscid, never bristly; escaped from cult.; Jo Daviess and 

 Lee counties. Clammy Locust R. viscosa Vent. 



22. Wisteria Nutt. 



1. Inflorescence glandular; leaflets 9-15; swampy woods, rare, s. 111.; 

 also Washington and Peoria coimties, where it is probably 

 escaped from cult. June-July. Kentucky Wisteria. [W . jrutes- 

 cens sensu auth., non (L.) Poir.] W . macrostachya Nutt. 



1. Inflorescence not glandular; leaflets 15-19; escaped from cult.; nat. 



from Japan. [W . sinensis sensu auth., non (Sims) Sweet] 



...W. floribunda (Willd.) DC. 



23. Astragalus L. — Milk-vetch 

 1. Flowers purplish. 



2. Calyx puberulent; flowers 8-10 mm long; pods glabrous; dry 

 soil, local; w. 111.; [Holophacos distortus (T. & G.) Rydb.] 

 A. distortus T. & G. 



2. Calyx hirsute; flowers 15-20 mm long; pods hirsute; Boone Co., 



May 23, 1918, H. C. Benke 2456 (as A. hypoglottis) ; adv. 



from w. U.S. [A. agrestis sensu auth., non Dougl.] 



A. gonial us Nutt. 



1 . Corolla whitish or cream or greenish-yellow. 



3. Calyx-teeth subulate. 



4. Leaflets 1.5-4 cm long; pods ellipsoid, glabrous; I'iver banks 



and hillsides throughout 111. June-Aug A. canadensis L. 



4. Leaflets 5-15 mm long; pods ovoid, pubescent; dry slopes, or 

 on prairie soil; Grundy, Lake, La Salle, Lee, and Ogle 



counties. May-June A. tennesseensis A.Gray 



3. Calyx-teeth deltoid; leaflets 5-15 mm long; pods glabrous, sub- 

 globose; prairies, rare; Macoupin, Madison, St. Clair, and 



Will counties. [Geopruinrwn trichocalyx (Nutt.) Rydb.] 



A. trichocalyx Nutt. 



24. Sesbania Scop. 

 S. exaltata (Raf.) Cory. Adv. from southern U.S.; Pulaski Co. 



