FAMILY KEY 23 



U. Leaflets very unequal, the lateral two very much smaller than the ter- 

 minal one. . Solanum in Solanaceae (p. 197) 

 UU. Leaflets all three about the same size. 

 V. Marsh plants; leaflets oblong to obovate, obtuse; stems 1-2 cm. thick. 



Menyanthes in Menyanthaceae (p. 180) 

 VV. Not marsh plants; leaflets obcordate; stems less than s mm. thick. 



OXALIDACEAE (p. 144) 



XT. -Leaflets more than 3 or spinelike or spine-tipped; styles or stigmas 



1-3- 



W. Stigmas 3; capsule 3-celled. Polemoniaceae (p. 183) 



WW. Stigmas 1-2; capsule' 1-2-celled. Hydeophyilaceae (p. 185) 



SS. Ovary inferior or mainly so; flowers in heads. Compositaceae (p. 218) 



GROUP 15 — Dicotyledonous herbs without green color, 

 and with alternate simple leaves or scales 



A. Vines, twining, white or yellow; ovary 2-celled, 1-4-seeded; leaves mere minute 



scales or almost none. Convolvulaceae (p. 182) 



AA. Not vines, variously colored; ovary not 2-ceUed, many-seeded; leaves not 



mmute, larger. 



B. Leaves spatulate, covered with long glandular hairs, all basal; plants of peat 



bogs. Droseraceae (p. 116) 



BB. Leaves not spatulate, not covered with long glandular hairs, not all basal; 



plants not of peat bogs. 



C. Flowers irregular; stamens didynamous, inserted in the tube of the corolla; 

 cells of the ovary i. Orobanchaceae (p. 209) 



CC. Flowers regular or nearly so; stamens not didynamous, inserted on the recep- 

 tacle; cells of the ovary i or 4 or 5. 

 D. Plants reddish, glabrous, 25 mm. or less high; stem not densely covered 

 with scales; scales entire; pollen grains in 4's. 



Pyrola in Pyrolaceae (p. 169) 

 DD. Not as above in all points; poUen grains simple. 



Monoteopaceae (p. 170) 



GROUP 16 — Dicotyledonous herbs with alternate simple, 

 leaves and apetalous flowers 



A. Ovary and fruit superior. 

 B. Pistils more than i, distinct. 

 C. Plant 1-3. 5 m. high; leaves ovate-lanceolate, pinnately veined, petioled, 

 entire, 2-3 dm. long. Phytolaccaceae (p. 86) 



CC. Plants mostly not so high; leaves not as above in all characters. 

 D. Stamens on the calyx; stem 2-20 cm. long; leaves rounded, cuneate at 

 base, 4-13 mm. long, deeply 3-lobed, lobes 2-4-cleft; stipules large, 2-5- 

 cleft. Akkemilla in 'RoSACEAE (p. 125) 



DD. Stamens on the receptacle; stems often longer; leaves not as above in all 

 characters; stipules none, but the base of the petiole often dilated. 



Ranunculaceae (p. 95 ) 



