PRIMULACEAE (PRIMROSE FAMILY) 375 



1. Androsace occidentals Pursh, Fl. Am. Sept. 137. 1814. Minutely 

 pubescent, not over 1 dm. high: radical leaves and those of the conspicuous 

 involucre oblong-ovate or spatulate, entire, sessile: scapes diffuse: lobes of the 

 calyx as long as the tube: lobes of the corolla oblong, shorter than the calyx: 

 calyx-tube obpyramidal in fruit, whitish with conspicuous green teeth which 

 surpass the capsule. From Illinois to the eastern base of the Rocky Moun- 

 tains. 



2. Androsace puberulenta Rydb. Bull. Torr. Bot. Club 30: 260. 1903. A 

 puberulent, rosulate annual: leaves oblanceolate, 1-3 cm. long, acute, entire x>r 

 sinuately denticulate, densely puberulent: peduncles several, 3-10 cm. long; 

 bracts narrowly lanceolate, 3-4 mm. long; pedicels 1-5 cm. long, spreading, 

 densely puberulent: calyx 3-4 mm. long, cleft to the middle; tube glabrous, 

 turbinate; lobes lanceolate, strongly keeled, densely puberulent, in fruit much 

 exceeding the short capsule: corolla white, about equaling the calyx. From 

 New Mexico to Manitoba. 



3. Androsace diffusa Small, Bull. Torr. Bot. Club 25: 318. 1898. Leaves 

 oblanceolate to spatulate or nearly linear, 1-4 cm. long, obtuse or acute, 

 sharply serrate or sparingly toothed: scapes erect and spreading, 5-10 cm. 

 long or shorter; pedicels filiform, very variable in length, -of ten 1-8 cm. long 

 in the same cluster: corolla white or pink, included; segments oblong, obtuse 

 or retuse at apex: capsules sub globose, about 3 mm. in diameter. In rocky 

 soil; western arctic America to the Dakotas, New Mexico, and Arizona. 



4. Androsace septentrionalis L. Sp. PL 142. 1753. Almost glabrous: 

 leaves lanceolate or oblong-lanceolate, narrowed at base, from irregularly 

 denticulate to laciniate-toothed : scapes erect, 8-20 cm. high; bracts of the 

 small involucre subulate: lobes of the calyx mostly shorter than the tube: 

 lobes of the corolla obovate, longer than the calyx. (A. pinetorum Greene, 

 Pitt. 4: 149. 1900.) From New Mexico far northward and westward; also 

 in Europe. 



* 5. Androsace subumbellata (A. Nels.) Small, 1. c. 319. Similar to the 



E receding but greatly reduced in size, only a few cm. high: leaves 5-10 mm. 

 >ng, oblong, rather thick, mostly entire: scapes few-flowered, short, some- 

 times shorter than the pedicels. In the alpine regions of our range. 



6. Androsace filiformis Retz. Obs. 2: 10. 1779-91. Annual: leaves ovate, 

 obtuse, narrowed at base to a winged petiole, entire, 5-10 mm. long: scapes 

 filiform, 5-20 cm. high; bracts of the involucre minute, subulate; pedicels 

 filiform: calyx-tube hemispherical, green, with short triangular lobes: tube 

 of the corolla at length much longer than the calyx, the short ovate lobes 

 closely reflexed: capsule ovoid, much longer than the calyx: seeds globular, 

 minutely tuberculate. (A. capillaris Greene, 1. c. 148.) Cold wet banks, in 

 the mountains and in the arctic regions. 



5. DODECATHEON L. SHOOTING STAR. AMERICAN COWSLIP 



Low acaulescent perennial herbs, with entire leaves and few or numerous 

 flowers in an umbel terminating a naked scape. Calyx deeply 5-lobed, the 

 lobes reflexed in flower, erect in fruit. Corolla 5-parted, with very short 

 tube and dilated thickened throat, the long and narrow divisions reflexed. 

 Stamens inserted on the throat of the corolla; filaments short and flat, mona- 

 delphous, but separable in age. Style filiform, exserted; stigma small. Pla- 

 centa columnar, many-ovuled. 



Capsule dehiscing by valves from the apex; filaments united and yel- 

 low, or wanting. 

 Filaments short or wanting, the stamineal tube, if any, rarely more 



than 1 mm. long. 



Scape stout; leaves thickish; flowers many; bracts acute . . 1. D. radicatum. 

 Scape slender; leaves thin; flowers few; bracts obtuse or acute . 2. D. philoscia. 

 Filaments evident, the stamineal tube from one half to as long as the 



anthers. 

 Anthers and stamineal tube subequal. 



Plant more or less puberulent; bracts lanceolate, acute . . 3. D. Cusickii. 

 Plant wholly glabrous: bracts oblong, mostly obtuse , . 4. P. salinum. 



