KEY FOR JUNE TO NOVEMBER 



535 a Leaves hollow, pitcher-shaped, with a terminal lid 



Sarracenia. p 160 

 b Leaves not as in a 536 



536 a Leaves all basal 537 



b Stem leaves present and sometimes basal ones also .... 540 



537 a Leaves clothed with sticky hairs Drosera. p 160 



b Leaves not clothed with sticky hairs 538 



538 a Leaves conspicuously thick and fleshy. .Sempervivum. p 161 

 b Leaves not thick or fleshy 539 



539 a Flowers with 10 stamens; flowers in racemes .. Pyrola. p 194 

 b Flowers with 5 fertile stamens ; flowers solitary on a 



i -leafed flowering stalk Parnassia. p 161 



540 a Some or all of leaves opposite or in whorls on the stem 541 

 b All leaves alternate on the stem 570 



541 a Petals 2 ; stamens 2 ; ovary covered with hooked bristles 



especially in fruit Circaea. p 190 



b Petals 4 or more ; stamens 4 or more 542 



542 a Ovary inferior 543 



b Ovary superior 544 



543 a Plant growing prostrate on the ground Isnardia. p 189 



b Plants erect Epilobium. p 190 



544 a Stamens 15 or more 545 



b Stamens 12 or less 546 



545 a Leaves in a single whorl beneath the single white 



flower Syndesmon. p /5J 



b Leaves opposite, not in a single whorl. .Hypericum. p 186 



546 a Prostrate herb with leaves in whorls of 5 or 6 ; flowers 



in the axils of the leaves Mollugo. p 14.9 



b Plants not completely as in a 547 



547 a Flowers with 2 sepals; leaves usually 2, linear, 3-8 in. 



long Claytonia. p 14.9 



b Flowers with 4 or more sepals or with a tubular calyx 548 



548 a Calyx tubular with 4 or more lobes or teeth 549 



b Calyx of separate sepals 558 



549 a Flowers about }4 in. long; petals 4 Rotala. p 189 



b Flowers % in. or more long or broad 550 



550 a Plant clothed with long, silky hairs; leaves linear 



Agrostemma. p 149 

 b Plants not completely as in a 551 



551 a Flowers in axillary clusters; plant 3-10 ft. high 



Decodon. p 189 

 b Plants not completely as in a 552 



552 a Flowers purple; stamens usually 8, sometimes 6-12, 



attached to the tube of the corolla 553 



b Flowers not purple ; stamens 10 554 



553 a Flowers about % in. broad, in bracted spikes. Lythrum. p 189 

 b Flowers 1-2 in. broad, not in bracted spikes. .Rhexia, p 189 



59 



