336 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Stellaria ameiicana (Porter) Standi. Frequent on rock slides and exposed 

 rocky slopes above timber line; occasionally found on rocky slopes at middle alti- 

 tudes, especially near snow banks. Mont. (AJsine americana Rydb.)^Stems very 

 leafy, forming loose prostrate mats; leaves ovate or oval, 1 to 3 cm. long, usually 

 obtuse; petals longer than the sepals. 



The plant is extremely viscid when fresh. 



2. Stellaria longipes Goldie. Occasional on the east slope at low altitudes, in 

 moist meadows or thickets. Alaska to Colo., Que., and Greenl. (Alsine longipes 

 Coville.) — Perennial, with slender, usually erect stems; leaves linear, 1 to 3 cm. 

 long, often shining, acute; flowers on long slender stalks; calyx 4 to 5 mm. long. 



3. Stellaria umbellata Turcz. Occasional above timber line, on open rocky slopes; 

 sometimes in woods at middle altitudes. Oreg. to N. Mex. and Mont.; also in Asia, 

 (Alsine baicalensis Coville.) — Stems very slender, erect or ascending, 5 to 20 cm. 

 high; leaves 5 to 20 mm. long, acute; sepals 2 to 2.5 mm. long, about half as long as 

 the capsule. 



4. Stellaria alpestris Fries. Occasional on the east slope at low altitudes, in bogs. 

 Alta. to Colo, and Ont. ; also in Eur. (Alsine alpestris Pi.ydb . )^Stems very slender, 

 20 to 40 cm. high, glabrous, erect or ascending; leaves 2 to 6 cm. long, acute; sepals 

 3 mm. long. 



5. Stellaria borealis Bigel. Frequent at low and rarely at middle altitudes, in 

 damp woods or thickets. Alaska to Calif., Colo., N. J., and Lab. (Alsine borealis 

 Britton.) — Stems slender, 15 to 40 cm. long, erect or sometimes procumbent, 

 glabrous; leaves 1 to 4 cm. long; flowers slender-stalked; sepals 3 to 4 mm. long. 



6. Stellaria laeta Richards. Blue chickweed. Open rocky slopes near Piegan 

 Pass. Alaska to Calif, and N. Mex. (Alsine laeta Rydb.) — Stems very leafy, tufted; 

 leaves 1 to 2 cm. long, acute; flowers mostly solita-rj- in the leaf axils; petals about 

 5 mm. long. 



The plant is very different from the other species in its pale bluish leaves. 



7. Stellaria crassifolia Ehrh. Wet thicket near St. Mary. Alta. to Colo., Pa., 

 and Lab. (Alsine crassifolia Britton.) — Stems very slender, 15 to 30 cm. long, 

 glaibrous; leaves 5 to 20 mm. long, oblong-lanceolate, acute; petals slightly longer 

 than the acute sepals. 



8. Stellaria media (L.) Cyrill. Common cecickweed. Abundant about Lewis's. 

 Native of Eur.; naturalized as a weed in N. Amer. (Alsine media L.) — Annual, 

 with slender prostrate stems; leaves broadly ovate, 5 to 20 mm. long, acute or obtuse, 

 thin; sepals minutely glandular-hairy; petals shorter than the sepals. 



9. Stellaria crispa Cham. & Schlecht. Frequent at nearly all altitudes, in moist 

 woods or thickets or on open slopes. Alaska to Calif., Wyo., and Alta. (Alsine 

 crispa Holzinger.) — Stems very slender, prostrate, 10 to 30 cm. long; leaves ovate, 

 5 to 20 mm. long, acute; petals minute or none. 



10. Stellaria obtusa Engelm. Frequent at middle altitudes and sometimes above 

 timber line, in woods or on open slopes. B. C. and Wash, to Colo, and Alta. (Alsine 

 obtusa Rose.) — Stems slender, 10 to 20 cm. long, prostrate, forming dense mats, 

 glabrous; leaves 4 to 10 mm. long, acute; petals none or minute. 



6. SAGINA L. 



1. Sagina saginoides (L.) Britton. Pearlwort. Frequent at all altitudes but 

 most common at middle elevations, on moist banks or slopes or in woods, often along 

 banks of streams and lakes. Alaska to Calif., N. Mex., Que., and Greenl.; also in 

 Eur. and Asia. — Slender perennial, 2 to 8 cm. high, loosely tufted, glabrous or nearly 

 bo; leaves filiform, 5 to 12 mm. long; flowers on slender stalks in the leaf axils; sepals 

 1.5 to 2 mm. long, very obtuse; petals much shorter than the sepals, white. 



