FAMILY KEY 



19 



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

 C. Plants with milky juice. Euphorbia in Eufsorbiaceae (p. 14s) 



CC. Plants without milky juice. 

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

 high. Urtica in Ueticaceae (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 6r sessile 

 stigmas 2-5. Caryophyllaceae (p. 89) 



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

 styles and stigmas 1—2. 

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



Synthyris in Scrophulaeiaceae (p. 198) 

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



Chrysosplenium in Saxifeagaceae (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 stiii or iJeshy; styles or stigmas 2. 



Chenopodiaceae (p. 83) 

 AA. Petals present. 



I. Sepals 2; plants without milk juice. Poetulacaceae (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. Ceassulaceae (p. 117) 



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

 ovary not lobed. Tissa in Caeyophyllaceae (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. Elaline 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 s each. Parnassia in Saxitragaceae (p. 118) 



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

 sepals and petals and stamens not always s each. 

 O. Sepals 2-3; ovary 3-18-celIed; placentae parietal. 



Papaveeaceae (p. 104) 

 00. 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. Hypeeicaceae (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) 



Q Q. Stem terete. 



