160 RHAMNACEAE. 



celled and lobed (in ours), with 2 ovules in each cell (in ours); 

 endosperm none. 



224. ACER. MAPLE. 



Trees or shrubs; leaves opposite, palmately-lobed, without 

 stipules; flowers small, polygamo-dioecious, in clusters; calyx 

 colored, usually 5-lobed; petals 5 and equal or none; stamens 

 3-12; styles 2; ovary 2-lobed, 2-celled; ovules 2 in each cell; 

 fruit a double samara, 2-winged above, separable at maturity, 

 each 1 -seeded. 



Acer glabrum douglasii (Hook.) Piper. Small tree, 3-10 m. high, with 

 smooth light-gray bark; leaves simple, rarely 3-foliolate, orbicular, acutish, 

 5-lobed, coarsely serrate, truncate or subcordate at base, glabrous, dark-green 

 above, paler beneath, 5-10 cm. long; petiole slender; flowers polygamous, in 

 small corymbs; petals narrow, spatulate-oblong, veiny, about as long as the 

 similar sepals; fruit glabrous, roughened, the wings diverging at less than a 

 right angle, 2.5-3 cm. long. In the mountains, along streams. 



Family 54. BALSAMINACEAE. BALSAM FAMILY. 



Usually glaucous succulent herbs with watery juice; leaves 

 alternate, simple, without stipules; flowers irregular with a 

 petal-like imbricated usually spurred calyx; petals 4, united in 

 two pairs; stamens 5, with short filaments and more or less 

 united anthers; ovary 5-celled; seeds without endosperm. 



225. IMPATIENS. JEWELWEED. 



Delicate herbs with translucent stems; leaves coarsely toothed, 

 petioled; flowers axillary or panicled, often of two kinds; large 

 sterile ones and smaller cleistogamous ones which ripen good seed; 

 sepals apparently four, the posterior ones usually spurred ; petals 

 4, united in two pairs; filaments 5, each with a scale-like append- 

 age; appendages united and covering the stigma; pod with 

 evanescent partitions, opening suddenly when touched and 

 projecting the seeds. 



Impatiens biflora Walt. Stems erect, often branched above, 60-90 cm. 

 high; leaves elliptical, acute, coarsely crenate-serrate, paler beneath, 5-8 cm. 

 long, the petioles nearly as long; flowers orange-colored, spotted with brown; 

 saccate sepal longer than broad ; tapering into a spur half as long. Swamps and 

 springy places, Spokane, Rock Lake and Mud Lake, Idaho. 



Family 55. RHAMNACEAE. 



Erect shrubs or small trees; leaves simple; stipules small and 

 early deciduous or none; flowers small and regular, sometimes 

 polygamo-dioecious; disk fleshy; calyx 4- or 5-toothed; petals 



