342 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Banunculus reptans L. Creeping buttercup. Frequent at low altitudes, in 

 mud or sand along streams and lakes; also abundant on wet slopes at Swiftcurrent 

 Pass. Alaska to N. Mex., N. J., and Lab. — Stems creeping, slender, glabrous, 5 to 

 30 cm. long; leaves linear to oblanceolate, 1 to 3 cm. long; petals 2 to 4 mm. long; 

 fruit heads globose. 



2. Ranunculus pursMi Richards. Occasional on the east slope at low altitudes, 

 about pools or along streams. Alaska to Colo., Ont., and N. S. {R. limosus Nutt.)— 

 Stems glabrous or hairy; leaves 1 to 2 cm. wide, deeply lobed, the lobes narrow; 

 petals 4 to 5 mm. long; fruit heads globose, aboiit 5 mm. long. 



The typical form is glabrous; the hairy form is R. limosus Nutt., but there seem to 

 be no constant differences between the two. Both are found in the park. 



3. Ranunculus oreganus (A. Gray) Howell. Wooded swamp below Lake McDer- 

 mott. Wash, and Oreg. to Mont. — Stems stout, 20 to 50 cm. high; leaflets deeply 

 lobed and toothed; petals 5 to 7 mm. long; achenes glabrous. 



4. Ranunculus macounii Britton. Occasional at low and sometimes at middle 

 altitudes, in wet woods or thickets or about pools on prairie. B. C. to N. Mex., Iowa, 

 and Ont. — Stems 20 to 60 cm. long, erect or decumbent, branched; leaflets hairy, 

 lobed and toothed, 3 to 8 cm. long; petals 5 to 7 mm. long; fruit heads globose. 



5. Ranunculus bongardi Greene. Frequent at low and sometimes at middle 

 altitudes, in moist woods or thickets. Alaska to Oreg. arid Colo. — Stems erect, 30 

 to 60 cm. high; lower leaves 3 to 10 cm, wide, deeply lobed and toothed; petals 

 slightly longer than the sepals; achenes flattened, sometimes hairy when young. 



6. Ranunculus inamoenus Greene. East slope at low altitudes, on open hillsides 

 or along streams; scarce. Idaho and Mont, to N. Mex. — Stems stout, 20 to 30 cm. 

 high; basal leaves rounded or fan-shaped, toothed, or some of them lobed, the upper 

 leaves deeply lobed; petals 5 to 6 mm. long; head of achenes oblong. 



7. Ranunculus alpeophilus A. Nels. Frequent above timber line, in meadows or 

 on rocky slopes or rock slides. Idaho and Mont, to Colo. — Stems 10 to 30 cm. high, 

 glabrous, mostly 1-flowered; leaves 1.5 to 4 cm. wide, deeply lobed, the lobes obtuse; 

 head of achenes oblong. 



8. Ranunculus saxicola Rydb. Occasional on rocky slopes above timber line. 

 Alta. to Wyo. and Utah. (R. ramidosus Jones). — Stems glabrous, 10 to 15 cm. high; 

 lower leaves 2 to 4 cm. wide, lobed, the lobes usually acutish; stem leaves often 

 lobed to the base, the lobes narrow. 



9. Ranunculus suksdorfii A. Gray. On moist cliffs at Cracker Lake. Wash, to 

 Alta. and Mont. — Stems glabrous, about 10 cm. high, usually 1-flowered; basal leaves 

 1.5 to 3 cm. wide, lobed, the lobes acutish; stem leaves 3 or 5-cleft, with narrow lobes. 



The last three species are closely related, and it is doubtful whether they are dis- 

 tinct. They are showy plants which are often abundant and conspicuous in alpine 

 localities, frequently flowering up to the very edges of the snow banks. 



10. THALICTRUM L. Meadow-rue. 



Tall perennials with rootstocks and yellow roots, glabrous or nearly so; leaves com- 

 posed of numerous broad, toothed or lobed, stalked leaflets; petioles with dilated 

 sheathing bases; flowers greenish; sepals 4 or 5; petals none; stamens numerous, 

 long and conspicuous; fruit of several ribbed achenes. 



Achenes less than 3 times as long as broad, 2.5 to 3.5 mm. wide . 1. T. megacarpum. 

 Achenes about 4 times as long as broad, 2 mm. wide 2. T. occidentale. 



1. Thalictrum megacarpum Torr. Common nearly everywhere except on prairie 

 and at the highest altitudes, usually in moist woods or thickets, sometimes in meadows 

 or on open slopes. Idaho and Mont, to Colo. — Stems 30 to 80 cm. high; leaflets thin, 

 1.5 to 6 cm. wide, pale beneath; achenes 6 to 8 mm. long. 



