14 General Key to the Families 



IV. Polygonum. (Tourn.) L. 



1. P. viviparum. L. Alpine Bistort. 



2. P. bistortoides. Pursh. Heart-leaved Bistort. 



3. P. Muhlenbergii. (Meisn.) Wats. Szvamp Persi- 



ORDER XVI. CHENOPODIALES 



XXV. CHENOPODIACE^. GOOSEFOOT FAMILY 



Herbs or shrubs of homely aspect; leaves more or less succu- 

 lent, alternate, without stipules ; flowers minute, with the free calyx 

 imbricated in the bud, usually in axillary and terminal panicles or 

 racemes; fruit an achene or utricle. 



I. Chenopodium. (Tourn.) L. 



1. C. album. L. Lamb's Quarters. (Introduced.) 



2. C. capitatum. (L.) Asch. Strazvberry Blite. 



ORDER XVII. CARYOPHYLLALES 



XXVI. CARYOPHYLLACE^. PINK FAMILY 



Herbs with bland and inert juice, the stems usually swollen at 

 the nodes; leaves opposite, entire, often united at the base; flow- 

 ers symmetrical, with or without petals ; fruit a capsule opening by 

 valves at the summit. 



I. Arenaria. L. 



1. A. lateriflora. L. Blunt -leaved Sandwort. 



2. A. capillaris var. nardifolia. (Ledeb.) Kegel. Nar- 



rozv-leaved Sandwort. 



3. A. verna var. propinqua. (Richards.) Fernald. 



Vernal Sandwort. 



4. A. sajanensis. Willd. One-flowered Sandwort. 

 II. Stellaria. L. 



1. S. longipes. Goldie. Long-stalked Stitchwort. 



2. S. borealis. Bigel. Northern Stitchwort. 

 III. Cerastium. L. 



1. C. arvense. L. Field Mouse-ear Chickweed. 



2. C. alpinum. L. Alpine Mouse-ear Chickweed. 



