374 PRIMULACEAE (PRIMROSE FAMILY) 



small flowers. Calyx campanulate, 5-lobed, persistent. Corolla-tube equaling 

 or surpassing the calyx, somewhat inflated above; the throat more or less 

 contracted and 5-crested beneath the sinuses. Stamens included, distinct, 

 with short filaments and blunt anthers. Ovary 5-ovuled; style filiform. 

 Capsule turbinate, 1 or 2-seeded. 



Flowers solitary; leaves dark green, subulate, imbricated on the shoots 



from the slender branches of the caudex . . . . . . 1. D. montana. 



Flowers 2-3 (sometimes solitary); leaves pale, closely rosulate on the 

 crowns of the low-caespitose caudex . . . . . . 2. D. biflora. 



1. Douglasia montana Gray, Proc. Am. Acad. 7: 371. 1868. Caespitose, 

 the caudex slender-branched and terminating in short leafy shoots: leaves 

 subulate, somewhat interruptedly imbricate-clustered, sparsely and minutely 

 ciliate, about 4 mm. long: peduncles short, slender, 1-flowered, with 1-2 

 minute bractlets: corolla-tube equaling the calyx; corolla-lobes obovate- 

 cuneate, about 4 mm. long. In the mountains of northern Wyoming and 

 in Montana. 



2. Douglasia biflora A. Nels. Bull. Tor. Bot. Club 25: 277. 1898. Broadly 

 caespitose, the numerous suffrutescent branches of the depressed caudex 

 crowned with a rosulate cluster of leaves: leaves lanceolate-linear, blunt, 

 9-12 mm. long: peduncles pubescent, fascicled, 3-5 from the terminal rosette 

 of leaves, 1-3 cm. long, bearing usually a terminal, nearly sessile flower and 1 

 or 2 lateral, slender-pediceled ones (sometimes only the terminal one) : calyx- 

 tube subscarious, turbinate; calyx-lobes about as long as the tube: corolla- 

 tube as long or longer than the calyx, ecfualed by the obovate, truncate, 

 emarginate or denticulate lobes: capsule subspherical (turbinate at base). 

 Northern Wyoming and in Montana. 



3. DROSACE A. Nels. 



Perennials with depressed-caespitose branched caudex. Leaves rosulate- 

 imbricated on the crowns of the caudex. Scapes (peduncles) solitary from 

 each of the several crowns, few to several-flowered. Flowers in a subcapitate 

 umbel. Corolla white or yellowish. Capsule few-seeded. 



1. Drosace carinata (Torr.) A. Nels. A depressed perennial, the short 

 branches of the caudex terminating in a close rosulate cluster of leaves: leaves 

 small, usually less than 1 cm. long, mostly oblong, subacute, white-ciliate, 

 somewhat keeled: scape and umbel moderately ciliate-hirsute : calyx-tube 

 campanulate, as long as the lanceolate lobes: corolla-lobes obovate, as long 

 as the tube: stamens near the middle of the tube: capsule globose. An- 

 drosace Chamaejasme. (Probably not A. Chamaejasme Willd. Sp. PI. 1: 799; 

 Douglasia Johnstonii A. Nels. Proc. Biol. Soc. Wash. 20: 57. 1907.) Colo- 

 rado and far northward in the Rocky Mountains. 



4. ANDROSACE L. 



Small annual herbs with tufted leaves and small white or pink flowers. 

 Calyx persistent, 5-lobed to 5-parted. Corolla salverform or funnelform; the 

 tube short, not longer than the calyx; the limb 5-lobed, imbricated in bud. 

 Stamens 5, included, distinct, with short filaments and short blunt anthers. 

 Style mostly short; stigma capitellate. Capsule short, 5-valved from the apex, 

 few to many-seeded. 



Corolla shorter than or barely equaling the calyx. 



Bracts of the involucre ovate or oblong 1. A. occidentalis. 



Bracts of the involucre lance-subulate. 



Calyx-lobes densely-puberulent, exceeding the capsule . . 2. A. puberulenta. 



Calyx-lobes glabrous, shorter than the capsule . . . 3. A. diffusa. 

 Corolla longer than the calyx. 



Capsule exceeded by the calyx-lobes. 



Scape long (9-20 cm.), usually much longer than the pedicels 4. A. septentrionalis. 



Scape short (2-5 cm ), often equaled or exceeded by the pedicels 5. A. subumbellata. 

 Capsule much exceeding the calyx-lobes . ... 6. A. filiformis. 



