STANDLEY — FLORA OF GLACIER PARK. 329 



Plants found about dried-up ponds near the east entrance are noteworthy because 

 of their very narrow, appressed leaves. 



12. Polygonum achoreum Blake. Occasional about St. Mary and the east entrance, 

 on dry open slopes or along roadsides. Mont, to Que. — Plants 15 to 30 cm. high, 

 branched, glabrous; leaves 1 to 2 cm, long, rounded at the apex; flowers 3 mm. long. 



13. Polygonum ramosissimum Michx. Tall knotweed. Along the railroad 

 near Belton; probably introduced. B. C. to Nev., N. Mex., and 111. — ^Annual, 20 

 to 50 cm. high, branched, glabrous, yellowish green; leaves 1 to 3 cm. long; flowers 

 3 mm. long. 



3. RTJMEX L. Dock. 



Perennials or annuals, usually with thick roots or with rootstocks; leaves alternate; 

 flowers small, the staminate and pistillate ones sometimes on different plants; sepals 

 6, the 3 inner ones sometimes with a seedlike tubercle on the back. 

 Inner sepals deeply toothed or lobed. 

 Lower leaves notched at the base, broadly ovate; only one of the inner sepals with 



a tubercle; stems usually unbranched 1. R. obtusifolius. 



Lower leaves narrowed at the base, lanceolate; all the inner sepals with tubercles; 



stems much branched 2. R. maritimus. 



Inner sepals not toothed or lobed, or very minutely toothed. 

 Inner sepals each with a tubercle on the back. 

 Leaves dark green, wavy or ruffled; inner sepals minutely toothed in fruit. 



3. R. crlspus. 



Leaves pale gi'een, flat; inner sepals entire 4. R. mexicanus. 



Inner sepals without tubercles. 

 Sepals in fruit 5 to 6 mm. wide; leaves without acid flavor; flowers all perfect. 



6. R. occidentalls. 

 Sepals 3 mm. wide or less; leaves with acid flavor; staminate and pistillate 

 flowers on separate plants. 

 Leaves narrowed at the base, without lobes or auricles . . . 6. R. paucifolius. 

 Leaves with auricles or lobes at the base . 

 Sepals not enlarged in fruit, the fruit projecting beyond them. 



7. R. acetosella. 

 Sepals enlarged in fruit, much longer than the fruit 8. R. acetosa. 



1. Rumex obtusifolius L. Bitter dock. A few plants near the chalets at St. 

 Mary. Native of Eur.; widely naturalized in N. Amer. — Plants 0.5 to 1 meter high, 

 with thick roots; basal leaves 15 to 30 cm. long; sepals green, in fruit 5 mm. long, 

 lobed about half way to the base, one of them with a tubercle. 



2. Rumex maritimus L. Goldex dock. East entrance, about dried-up pools on 

 prairie; scarce. B. C. to Calif., N. C, and N. B.; also in Eur. and Asia. — Annual, 

 30 to 60 cm. high, finely hairy or nearly glabrous; leaves 3 to 15 cm. long, stalked; 

 sepals green, about 2 mm. long, lobed nearly to the base, with 1 to 3 bristle-like lobes. 



3. Rumex crlspus L. Yellow dock. Rather rare, in thickets or waste ground at 

 low altitudes, sometimes extending high up along trails. Native of Eur.; widely 

 naturalized in N. Amer. — Perennial, 30 to 60 cm. high, with thick yellow roots; 

 leaves oblong or lanceolate, 15 to 30 cm. long, cordate to acute at base; sepals green, 

 3 to 5 mm. long. 



The leaves are often cooked and eaten as "greens." 



4. Rumex mexicanus Meisn. Pale dock. Frequent at low altitudes, in wet 

 open ground or thickets. B. C. to Mex., Mo., and Lab. — Glabrous perennial, 30 to 

 70 cm. high, usually branched and often forming dense clumps; leaves lanceolate, 

 5 to 15 cm. long, acute at the base; sepals green, about 5 mm. long. 



