46 KEY TO THE SPECIES 



XXXIII. GERANIACEyE (Geeaitium Family) 



Herbs with lobed or divided leaves, 5 sepals, 5 petals, 10 

 stamens, and a deeply lobed ovary whose 5 carpels separate 

 elastically from the elongated axis when mature. 



1. GERANIUM (Geranium) 



Perennial herbs with forking stems, swollen nodes, mostly opposite palmately 

 lobed leaves, scarious stipules and 1-3 flowered peduncles. 



1. Geranium Fremontii Terr. (Fremont's Gerakium). Tufted, closely 

 glandular-puberulent and sparsely pilose ; stems few, somewhat branched, stout- 

 ish, 8-5 dm. high ; leaves 3-7 cleft, the segments lobed or cleft ; petals light-purple. 

 Frequent on partially wooded, stony slopes. 



2. Geranium csespitosum James (Tufted Geranium). Many-stemmed 

 from the broad, matted base, slender, only 2-3 dm. high ; leaves smaller, deeply 

 5-7 cleft, pubescent but not glandular ; flowers purple. Sandy banks and ravines. 



3. Geranium Bichardsoni Fisch. & Mey. (Richardson's Geranium). Not 

 tufted, tall and slender, with flne appressed pubescence, glandular only on the 

 pedicels ; leaves cleft nearly to the base, the segments incisely toothed ; flowers 

 white or purplish. Moist woods along streams. 



XXXIV. LINAGES (Flax Family) 



Perennial herbs with regular 5-merous flowers, imbricated 

 calyx and convolute petals, stamens monadelphous at base, and 

 a 10-seeded, 10-celled pod. 



1. LINUM (Flax) 



Herbs with woody base, alternate, sessile leaves and cymose flowers, globose 

 pods and flattened seeds. 



1. L.inum Xewisii Pursh (Lewis's Wild Flax). Stems simple, slender, vir- 

 gate ; leaves linear ; corolla blue, 2-3 cm. broad ; petals ephemeral. 



XXXV. EUPHORBIACEiE (Spurge Family) 



Herbs with alternate simple leaves, milky, acrid juice, 

 monoecious or dioecious flowers (usually apetalous), a 3-celled 

 and 3-seeded ovary. 



1. EUPHORBIA (Spurge) 



Monoecious ; the flowers in a cup-shaped involucre which bears a gland in 

 each sinus ; staminate flowers numerous, borne on the wall of the cup, each of a 

 single stamen ; pistillate flowers solitary, pedicelled and soon exserted ; ovary and 

 capsule Slobed. 



