12 



KEY TO SEED PLANTS. 



Trees or shrubs. 



Stamens twice as many as the petals and alternate with them. 

 Leaves alternate, trifoliolate. 



Styles or stigmas 3; fruit drupe-like 



Anacardiacejs, p. 250. 



Style 1; fruit a 2-celled, 2-seeded samara 



Rtjtacejs, p. 249. 

 Leaves opposite, simple; style 1 or none; fruit a 3 to 5-celled 

 capsule; seeds with an aril. . Celastrace^e, p. 252. 

 Stamens 4 or 5, as many as the petals and opposite them. 



Shrubs; petals often hooded, commonly with claws; ovary 

 commonly 3-celled, splitting when ripe into 3 one-seeded 



parts KHAMNACEiE, p. 253. 



Woody vine, climbing by tendrils; petals early deciduous, 



cohering by their tips; fruit a berry 



Vitace^e, p. 259. 

 Stamens 7 to 9; petals 5, equal; fruit a double samara; leaves 



simple ... Acer macrophyllum, p. 252. 



Stamens 5 to 8; petals 4 or 5, clawed, slightly irregular; fruit a 



1-seeded capsule; leaves palmately compound 



Sapindacejs, p. 251. 

 Herbs; stamens 8 to 30; petals 4 to 7, la< iniate; disk 1-sided . . . 



ResedacejE, p. 230. 



Stamens on the calyx. 

 Corolla regular. 



Stipules present; pistils one to several, sometimes partly united 

 to the disk; petals 5; stamens 10 to numerous; leaves 

 alternate, often compound . . Rosacea, p. 275. 

 Stipules none; leaves simple. 



Pistils many, concealed in a hollow receptacle; leaves opposite, 



simple Calycanthaceje, p. 190. 



Pistil 1; petals 5; stamens 5 or 10 



SAXIFRAGACEiE, p. 267. 



Pistil 1, becoming a capsule enclosed by, but free from, the 

 tubular calyx; stamens 4 to 12; leaves simple, entire . . 



LythracEjE, p. 323. 

 Corolla irregular, papilionaceous; stamens monadelphous, or dia- 

 delphous, rarely distinct; fruit a legume; leaves commonly 

 compound Leguminos^e, p. 288. 



B. Ovary inferior, i. e., more or less adherent to the calyx. 



I. Trees and Shrubs. 



Stamens more numerous than the petals; petals 5. 



Leaves alternate; fruit a pome .... Rosacea, p. 276. 



Leaves opposite; fruit a capsule; trailing undershrub 



Whipplea, p. 272. 

 Stamens as many as the petals and opposite them; petals 5, hooded; 

 fruit 3-celled, 1 seed in each cell . . Ceanothus, p. 251. 



