KEY FOR MARCH, APRIL AND MAY 



304 a Flowers with 5 petal-like hoods inside and alternate 



with the petals Asclepias. p 200 



b Flowers not completely as in a Euphorbia, p 180 



305 a Petals or colored parts of the perianth joined into a 



tube at least at the base 306 



b Petals or perianth parts distinct, not joined into a tube 338 



306 a Perianth 6-lobed ; flowers blue ; leaves basal, linear, thick 



M us cart, p 135 

 b Plants not completely as in a 307 



307 a Leaves clustered in a single whorl at the top of the 



stem Trientalis. p 198 



b Leaves not clustered as in a 308 



308 a Leaves all basal, 3-foliolate Menyanthes. p igg 



b Leaves not all basal 309 



309 a Leaves opposite or in whorls on the stem 310 



b All leaves alternate 320 



310 a Flowers solitary or 2 together in the axils of the leaves 311 

 b Flowers not completely as in a 317 



311 a Flowers 2 together in the axils, their ovaries united; 



leaves thick Mitchella. p 213 



b Plants not completely as in a 312 



312 a Leaves rounded; flowers purplish; roots spicy 



Asarum. p 14.5 

 b Plants not completely as in a 313 



313 a Ovary inferior 314 



b Ovary superior 315 



314 a Flowers violet or blue; plant i ft. or less high 



Houstonia. p 213 

 b Flowers purplish-brown ; plant 2 ft. or more high 



Triosteum. p 215 



315 a Flowers with perianth lobes fringed Mitella. p 161 



b Flowers with perianth lobes not fringed 316 



316 a Flowers % in. or more broad, usually blue; leaves 



thick, evergreen Vinca. p 200 



b Flowers about }4 in. broad, scarlet or white; leaves 



not evergreen Anagallis. p 198 



317 a Ovary inferior 318 



b Ovary superior 319 



318 a Leaves opposite Houstonia. p 213 



b Leaves in whorls Galium. p 213 



319 a Corolla tube much shorter than the lobes 



Sabbatia campanulata. p IQQ 

 b Corolla tube nearly as long as the lobes Phlox, p 202 



320 a Creeping plant with rounded leaves; perianth 3-lobed, 



purplish ; roots spicy Asarum. p 145 



b Plants not completely as in a 321 



23 



