20 ANALYTICAL KEY 



p. Pods 4 cm. long, fully a third occupied by the prominent 

 two-edged beak; leaves scarcely petioled. 



CHARLOCK, BRASSICA ARVENSIS (p. 71). 



p. Pods less than 2 cm. long, with a very short beak; leaves 

 slender petioled. BLACK MUSTARD, BRASSICA NIGRA (p. 72). 

 m. None of the floral parts in fours or sixes. 

 n. Stamens more than ten. 



FROSTWEED, HELIANTHEMTJM CANADENSE (p. 94)- 

 n. Stamens ten. 

 o. Leaves simple, radical. 



SWAMP SAXIFRAGE, SAXIFRAGA PENNSYLVANIA (p. 74). 

 0. Stems leafy; leaves tri-foliolate. LADY'S SORREL, 



OXALIS STRICTA and 0. CORNICULATA (p. 85). 

 n. Stamens five (.Alum root). 



o. Calyx regular. HEUCHERA AMERICANA (p. 74)- 



o. Calyx oblique. HEUCHERA HISPID A (p. 74>- 



1. Flowers not yellow. 

 m. Plants with opposite entire leaves. 

 n. Sepals two; leaves two; flowers pink. 



SPRING BEAUTY, CLAYTONIA VIRGINICA (p. 58). 

 n. Sepals four or five (.Pink family). 

 O. Sepals distinct or nearly so. 

 p. Petals entire (Sandwort). 

 q. Leaves more than a centimeter long, obtuse. 



ARENARIA LATERIFLORA (p. 56). 

 q. Leaves less than a centimeter long, acute. 



ARENARIA SERPYLLIFOLIA (p. 56). 

 p. Petals notched or two-cleft. 

 q. Petals deeply two-cleft; styles 34; stems hairy in lines. 



CHICKWEED, STELLARIA MEDIA (p. 56). 

 q. Petals notched; styles five (Cerastium). 



T. Stems annual; petals longer than the sepals; plant smooth- 

 ish; pedicels and pods much elongated. 



CERASTIITM NTJTANS (p. 57). 



Jr. Stems perennial; petals not longer than the sepals; plant 

 clammy hairy; pedicels and pods short. 



CERASTIITM VULGATUM (p. 57). 

 o. Sepals united; internodes glutinous. 



SLEEPY CATCHFLY, SILENE ANTIRRHINA (p. 57). 

 m. Plants without opposite leaves, or if opposite, not entire. 

 n. Petals white (p. 21). 

 O. Stamens more than ten. 

 p. Leaves decompound; sepals four or five. 



WHITE BANEBERRY, ACTAEA ALBA (p. 64). 

 p. Leaves simple, 59 parted; sepals six. 



MAY APPLE, PODOPHYLLTJM PELTATUM (p. 66). 

 o. Stamens ten (Saxifrage family). 

 p. Leaves not heart-shaped; ovary two-celled. 



EARLY SAXIFRAGE, SAXIFRAGA VIRGINIENSIS (p. 74). 

 p. Leaves heart-shaped; ovary one-celled. 

 q. Stems with two opposite leaves; petals pinnatifid. 



BISHOP'S CAP, MITELLA DIPHYLLA (p. 75). 

 q. Stems leafless, or if leafy, leaves not opposite; petals entire. 



