ROSE FAMILY 425 



filaments filiform, but short, inclined. Pistils 5-20; styles lateral. Ovule and 

 seed attached near the base of the style, ascending and amphitropous. 



1. S. procumbens L. Stems less than 1 dm. high, more or less hirsute- 

 strigose; leaflets sparingly appressed-pilose, 1-2 cm. long, broadly cuneate, 3-5- 

 toothed at the apex; flowers few in rather dense cymes; bractlets and sepals 

 subequal, broadly oblong or ovate; petals yellow, spatulate, shorter than the 

 sepals. Arctic and alpine regions: Greenl. N.H. Colo. Calif. Alaska; 

 arctic and alpine Eurasia. Alp. Subalp. Je-Au. 



17. DASIPHORA Raf. SHRUBBY CINQUEFOIL, YELLOW ROSE. 



Shrubs, with scarious sheathing stipules, pinnate leathery leaves, and axil- 

 lary flowers. Hypanthium saucer-shaped. Bractlets, sepals, and petals 5. Petals 

 in ours yellow, nearly orbicular, neither unguiculate nor emarginate. Stamens 

 about 25, in 5 festoons on a pentagonal disk; filaments filiform; anthers oblong, 

 flat, not didymous, dehiscent by a longitudinal slit along the margin. Receptacle 

 hemispheric, with numerous pistils; styles club-shaped, thick and glandular 

 upward, inserted near or below the middle of the ovaries; stigmas large and 

 evidently four-lobed; achenes densely covered with long straight hairs. Seeds 

 ascending and amphitropous. 



1. D. fruticosa (L.) Rydb. Shrub 3-15 dm. high; branches with brownish 

 shreddy bark; leaves pinnate, with 3-7 approximate leaflets, silky above, silky 

 and whitish beneath; leaflets oblong or linear-oblong; flowers in small loose cymes 

 or solitary, large, 1.5-3 cm. in diameter; petals yellow, orbicular, often twice as 

 long as the sepals. Cold valleys and among rocks: Lab. Alaska Calif. 

 N.M. N.J.; w Eu.; e Asia. Submont. Subalp. Je Au. 



18. DRYMOCALLIS Fourr. 



Perennial herbs, with scaly rootstocks, glandular foliage, pinnate leaves, and 

 cymose inflorescence. Hypanthium saucer-shaped or hemispheric. Bractlets, 

 sepals, and petals 5. Petals obovate, elliptic, or nearly orbicular, neither unguicu- 

 late nor emarginate, yellow or white. Stamens 20-30, in 5 festoons on the much 

 thickened pentagonal disk around the receptacle; filaments filiform; anthers 

 oblong, truncate at each end or cordate at the base, flat and dehiscent by 

 longitudinal marginal slits. Receptacle hemispheric or semi-ellipsoid, with very 

 numerous pistils. Style nearly basal, in all our species except one thickened and 

 glandular a little below the middle and tapering to each end; stigma minute. 

 Seed attached near the base of the ovary, ascending and orthotropous. 



Style fusiform, less than twice as long as the ovary. 

 Sepals ovate to lanceolate, acute, rarely acuminate. 



Petals white or cream-colored, often, however, turning more yellowish in drying. 

 Petals slightly if at all exceeding the sepals; inflorescence many-flowered, 



Leaves densely hairy; petals orbicular or nearly so, 7-8 mm. long; cyme 



short and dense; stem densely short-hairy. 1. D. agrimonioides. 



Leaves sparingly hairy; petals obovate, 5-6 mm. long. 



Cyme short, flat-topped; leaflets rounded-obovate to flabelliform; stem 



and petioles not conspicuously long-hairy. 2. D. corymbosa. 

 Cyme elongate, narrow; leaflets more or less rhombic-obovate; stem 

 and petioles conspicuously long-hairy, especially below. 



3. D. convallaria. 

 Petals much exceeding the sepals; cyme open, few-flowered; stem slender. 



4. D. pseudorupestris. 

 Petals yellow in anthesis. 



Leaflets with ovate teeth. 



Petals much exceeding the sepals in length. 



Bractlets lanceolate to linear; sepals lanceolate or ovate-lanceolate. 

 Plant tall, 3-10 dm. high; cyme flat-topped. 



Leaflets rhombic-obovate, acute, at least the terminal one; 



inflorescence leafy. 5. D. foliosa. 



Leaflets of the basal leaves orbicular to obovate, obtuse; upper 



leaves reduced. 6. D. valida. 



Plant low, 2-3 dm. (rarely 4 dm.) high; cyme narrow, leafy; leaflets 



orbicular or rounded-obovate. 7. D. fissa. 



Bractlets elliptic or oval; sepals ovate; stem 1-1.5 dm. high, almost 

 scapose. 8. D. pumila. 



