FAMILY KEY 19 



BB. Leaves not dissected; pistil i; fruit without plumose tail. 

 C. Plants with milky juice. Euphorbia in EUPHORBIACEAE (p. 145) 



CC. Plants without milky juice. 



D. Plants with stinging hairs; stems mostly simple, erect, 4-angled, 6-21 dm. 

 high. Urtica in URTICACEAE (p. 76) 



DD. Plants without stinging hairs; stems not as above in all points. 

 E. Seeds several to many. 



F. Sepals 5; leaves entire or nearly so, ovate or narrower; styles or sessile 

 stigmas 2-5. CARYOPHYLLACEAE (p. 89) 



FF. Sepals 4; leaves crenate to pinnatifid, often reniform to orbicular; 

 styles and stigmas 12. 

 G. Stamens 2 or 4; style i ; leaves not wedge-shaped at base. 



Synthyris in SCROPHULARIACEAE (p. 198) 

 GG. Stamens 8; styles 2; leaves wedge-shaped at base. 



Chrysosplenium in SAXIFRAGACEAE (p. 118) 

 EE. Seed i. 



H. Lower leaves 2-lobed, the upper entire; stem weak and slender; styles 

 and stigmas 3. Pterostegia in POLYGONACEAE (p. 79) 



HH. None of the leaves 2-lobed; stem stiff or fleshy; styles or stigmas 2. 



CHENOPODIACEAE (p. 83) 

 AA. Petals present. 



I. Sepals 2; plants without milk juice. PORTULACACEAE (p. 86) 



II. Sepals or calyx segments more than 2, or else plants with milky juice. 

 J. Leaves very fleshy, thick. 



K. Stipules none; leaves terete or flattish; carpels distinct at least above, thus 

 making the ovary 3-s-lobed. CRASSULACEAE (p. 117) 



KK. Stipules scarious; leaves terete; carpels united to the tip and thus the 

 ovary not lobed. Tissa in CARYOPHYLLACEAE (p. 94) 



JJ. Leaves not fleshy, thin or coriaceous. 

 L. Leaves entire. 



M. Leaves obovate, scattered along an elongated prostrate or floating stem; 

 sepals and stamens 2-4. Elatine in ELATINACEAE (p. 152) 



MM. Leaves not obovate; stems often not as above; sepals and stamens 

 usually more numerous. 



N. Leaves all basal; ovary i -celled; placentae 3-4, parietal; sepals and 

 petals and stamens 5 each. Parnassia in SAXIFRAGACEAE (p. 118) 



NN. Leaves not all basal; ovary i-i8-celled; placentae axial or parietal; 

 sepals and petals and stamens not always 5 each. 

 O. Sepals 2-3; ovary 3-i8-celled; placentae parietal. 



PAPAVERACEAE (p. 104) 



OO. Sepals 4-6; ovary i-io-celled; placentae axial. 



P. Leaves punctate with immersed pellucid resinous glands, often with 

 small black spots; petals yellow, often black-spotted; stamens in 3 sets 

 in all but i species. HYPERICACEAE (p. 152) 



PP. Leaves not punctate, not black-spotted; petals not yellow (ex- 

 cept in i species of Linum), not black-spotted; stamens not in 

 sets. 



Q. Stem 4-angled. LYTHRACEAE (p. 156) 



QQ. Stem terete. 



