20 ANALYTICAL KEY 



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

 two-edged beak; leaves scarcely petioled. 



Charlock, BRASSICA ABVENSIS (p. 71). 

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

 slender petioled. BlaciC Mustard, BBASSZCA NIGBA (p. 72). 

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

 n. Stamens more than ten. 



Frost WEED, HELIANTHEMXrU CAKADENSE (p. 94). 

 n. Stamens ten. 

 o. Leaves simple, radical. 



Swamp Saxifrage, SAXIFEAGA PENNSTLVANICA (p. 74). 

 u. Stems leafy; leaves tri-foliolate. Lady's Sorrel, 



OXALIS STRICTA and O. CORNICTTLATA (p. 85), 

 n. Stamens five CAlutn root). 

 o. Calyx regular. HETTCHEBA AMEBICANA (p. 74)- 



0. Calyx oblique. HETJCHEEA HISPIDA (p. 74). 



1. Flowers not yellow. 

 m. Plants with opposite entire leaves. 

 n. Sepals two; leaves two; flowers pink. 



Spring Beauty, CLATTONIA VIEGINICA (p. 58). 

 n. Sepals four or five CPink family), 

 V, Sepals distinct or nearly so. 

 p. Petals entire (.Sandwort). 

 q. Leaves more than a centimeter long, obtuse. 



ABENAEIA LATEEIFLOEA (p. 56). 

 q. Leaves less than a. centimeter long, acute. 



AEENAEIA SEEPTLLIFOLIA (p. 56). 

 p. Petals notched or two-cleft. 

 q. Petals deeply two-cleft; styles 3-4; stems hairy in lines. 



Chickweed, STELLAEIA MEDIA (p. 56). 

 q. Petals notched; styles five iCerastium). 

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

 ish; pedicels and pods much elongated. 



CEEASTniM NUTANS (p. 57). 

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

 clammy hairy; pedicels and pods short. 



CEEASTIITM VTTLGATTTM (p. 57). 

 u. Sepals united ; internodes glutinous. 



Sleepy Catchfly, SILENE ANTIBBHINA (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, 5—9 parted; sepals six. 



May Apple, POBOPHYLLTIM PELTATUM (p. 66). 

 o. Stamens ten (.Saxifrage family). 

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



Early Saxifrage, SAXIFEAGA VIEGINIENSIS (p. 74). 

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

 q. Stems with two opposite leaves; petals pinnatifid. 



BiSH0p*s Cap, MITELLA DIPHYLLA (p. 75). 

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



