164 



GEOLOGY OF LA SALLE COUNTY. 



Sagina decumbens. Should follow Cerastium, 53. 

 Little matted herbs, leaves threadlike, awlshaped, 

 flowers small at end of branches. 



Hypericum Canadeiise, 54. Branches erect, four 

 angled, leaves three veined, linear, flowers small, 

 yellow. 



Rhamnus Alnifolia, 56. Calyx lobes and stamens, 

 5: leaves oval, acute, serrate, nearly straig'ht; a small 

 shrub. 



R. lanceolata. Calyx lobes, etc., four; leaves 

 oblong-. 



Polyg-ala Senega var. Latifolia, 62. Plant larger 

 than true P. senega, and leaves ovate. 



Erysmium cheiranthoides, 133. Comes before 

 Sisymbrium. Roug'hish, branching, slender, leaves 

 lanceolate, flowers small, four petals, yellow. 



Desmodium Canadense, 65. Hairy, 3-6 feet, leaf- 

 lets oblong'-lanceolate, obtuse. 



D. paniculatum. Nearly smooth, slender, flow- 

 ers paniculate. 



D. Illinoense. Rough with short hairs, leaves 

 ovate-oblong, obtuse. 



Agrimonia Eupatoria, 72. Root leaves interrupt- 

 edlv pinnate, flow^ers yellow in thick spikes. 



Tiedemania rigida, 80. Before Hercleum. Aquati 

 plant, leaflets narrow or none, leaflets 3-9, linear. Poi- 

 sonous. 



Zizia aura, 81. After Slum. Lower leaves 2-3 

 ternate, of root very long, flowers early, yellow. 



Cicuta Bulbifera, 81. Slender, 1-3 feet, leaves 2- 

 3 pinnate. Poisonous. Damp lands. 



Houstooia angustifolia, 85. Leaves narrowly 

 linear. 



Diadia teres, 85. Before Galium. A. hairy, 

 spreading, branches round, leaves linear, sessile, rigid. 



