BOTANY OF LA SALLE COUNTY. 65 



12 pairs. Banks of streams. 

 PETALOSTEMON. P. Prairie Clover. Flowers 



in dense, terminal heads; stems very leafy. 

 P. viola cens. Nearly smooth, leaflets 5, very nar- 



row; flowers Vi, P., J. 12 to 20 in. Dry fields. 

 P. candidus. Smooth; leaflets 7 to 9, lanceolate; 



flowers W. 12 to 20 in. with the former. 

 B. P. folio sus. Very leafy; leaflets 15 to 29, Jineas- 



oblong; flowers Rs. Found in 1882 by Prof. 



Boltwood on the McPherson place S side the 



road opposite the Reddick farm. 

 TEPHROSIA. Perennial herbs whitish with long-, 



silky hairs. 

 T. Virginiana. Goat's Rue. Catgut. Leafy to 



top; leaflets 17 to 29, linear-oblong 1 , small; flow- 1 



ers larg-e, showy in a cluster, W. ting-ed with 



P. Jh. J.; 1 to 2 ft. About Lover's Leap, 



Deer Park Tp. 

 ROBINIA. Locust Tree. Trees or shrubs armed 



with prickles and having- odd-pinnate leaves and 



flowers in axillary racemes. 

 R. Pseudacacia. Flowers W., fragrant. Timber 



valuable. M. 

 R. viscsa. Branchlets and petioles sticky; flowers 



P. Ju. 

 ASTRAGALUS. P. Milk-vetch. Leaves odd-pinnate; 



flowers W. in dense, thick spikes. 

 A. Plattensis. Reclining; leaflets oblong 1 ; in a 



short spike Y. W. often tipped with P. Ju. 



Gravelly lands. 

 A. Canadensis. Erect, tall, 2 to 3>^ ft.; leaflets 



21 to 27, oblong-; flowers G. W. in long close 



spikes; Ju. Dry lands. 

 DESMODIUM. P. Tick seed. Tick Trefoil. Pods 



deeply toothed, covered with hooked bristles by 



