FAM. 101. M 



7. Wings acuminate; — low. erect, often tufted; flowers yellow or green- 

 ish yellow; keel crested; stamens usually 6. style slender. Pine- 

 barrens. Throughout the year. ------ P. nana 



7. Wings cuspidate; — ascending or decumbent; flowers orange-yellow; 



keel with a small firmbriate crest; stamens 8; style slender, pro- 

 longed into a curved tufted appendage. Low pine-land. Spring 

 and Summer. - P. lutea, Wild Bachelor's Button 



8. Corolla white; — erect, branching above; wings ovate-lanceolate, keel 



with a minute fimbriate crest; stamens S; style slender. Low 

 pine-barrens. Summer. ------ P. Baldwin! i 



8. Corolla yellow. ____-____. .9 



9. Wings acuminate; — erect, branching above; wings twice or thrice 



larger than the other sepals; keel with a small fimbriate crest; 

 stame: B 'e slender, auricled above, prolonged into a curled 



appendage. Pine-barren swamps. Summer and Fall. - P. ramosa 



9. Wings cuspidate; — erect, branching above; wings nearly twice as 



large as the other sepals; keel with a crest of few small proces- 

 ses; stamens S; style broader at the middle, prolonged into a 

 curved appendage. Pine-barren ponds. Summer. - - P. cymosa 



10. Flowers in slender spike-like racemes. -- ----- 12 



10. Flowers in dense, ovoid or cylindric racemes, - - - - - 12 



11. Stamens erect, filiform; leaves in distant whorls of 4 or 5. setace- 



ous; flowers greenish, wings oval, keel crested; capsules longer 



than broad. Dry sand-hills. Spring and Summer. - P. leptostachys 



11. Stems short or long, branched; leaves usually in whorls of 4 or 5, 



linear; flowers greenish white, wings ovate, keel crested; cap- 

 sules longer than broad. Dry sandy soil. Spring to Fall. P. verticillata 



12. Racemes long-peduncled ; wings with a thick excurrent mid vein; — 



erect or decumbent, 4-angled; lower leaves in whorls of 4, lan- 

 ceolate or linear; flowers rose-purple, keel crested; stamens 8. 

 Bogs. Summer and Fall. ------ P. brevifolia 



Racemes sessile or short -ped uncled ; wings tapering into a long subu- 

 late point; — more or less branched. 4-angled; leaves in whorls 

 of 4 or 5. spatulate-linear; flowers rose-purple or greenish; keel 

 crested; stamens 8. Pine-barren swamps. Summer. - P. cruciata 



101. Euphorbiaceae, Spurge Family. 



Monoecious or dioecious herbs, shrubs or trees with 

 acrid, and often milky, sap; leaves simple with or with- 

 out stipules; flowers various, sometimes enclosed in a cup- 

 shaped involucre; calyx inferior or wanting; corolla colored, 

 scale-like or wanting; stamens few or many; ovary free, 

 mostly 3-celled; styles distinct or united; fruit a capsule, 

 mostly 3-lobed, separating when mature into three 2-valved, 

 1-2 seeded carpels, from a persistent axis. 



1. Flowers not in an involucre; calyx of several sepals, more or less united, - 2 



1. One fertile and several monandrous sterile flowers, without envelopes, 



enclosed in a common involucre (Euphorbias), - - - - 12 



2. Ovary 3-celled, cells 2-ovuled; — leaves alternate, sometimes resemb- 



