20 FAMILY KEY 



R. Leaves all opposite; ovary and capsule i -celled; seed not oily. 



CARYOPHYLLACEAE (p 89) 



RR. Some of the leaves alternate; ovary and capsule 2-io-celled; 

 seed oily. LINACEAE (p. 144) 



LL. Leaves not entire. 



S. Leaves evergreen, coriaceous, ovate to orbicular; flower i, on a scape 



at the summit of the simple stem. Moneses in PYROLACEAE (p. 169) 



SS. Leaves deciduous, herbaceous, narrowed; flowers mostly more than i; 



stem usually branched. 

 T. Stipules present; plant glandular- pubescent ; leaves oblanceolate. 



Bergia in ELATINACEAE (p. 152) 

 TT. Stipules none; plant not glandular; leaves lanceolate to spatulate. 



LINACEAE (p. 144) 



GROUP 12 Apetalous or polypetalous dicotyledonous 

 herbs with opposite simple leaves and inferior ovary 



A. Flowers in heads; heads subtended by a white involucre; involucre bracts 4-6, 



6-17 mm. long; fruit a red berry. Cornus in CORNACEAE (p. 168) 



AA. Either flowers not in heads or else involucre not white when present; fruit not a 



berry, not red. 



B. Flowers in umbels or heads. UMBELLACEAE (p. 163) 



BB. Flowers neither in umbels nor heads. 

 C. Flowers in terminal or axillary involucrate clusters. 



NYCTAGINACEAE (p. 85) 



CC. Flowers either not in clusters, or the clusters without involucre. 

 D. Leaves entire. 



E. Leaves ovate to reniform, all basal, with 3-7 large veins from the base; 



marsh plants. Parnassia in SAXIFRAGACEAE (p. 118) 



EE. Leaves narrower, not all basal, with only i large vein from the base; 



habitat various. 



F. Stem 4~5-angled; leaves linear to linear-oblong; calyx tube less than 



i cm. long. LYTHRACEAE (p. 156) 



FF. Stem terete; either the leaves wider than in F or the calyx tube more 



than i cm. long. ONAGRACEAE (p. 156) 



DD. Leaves not entire. 



G. Leaves roundish, abruptly cuneate at base, crenate above; petals none; 



stems repeatedly forked; flowers mostly solitary in the upper forks of the 



stem. Chrysosplenium in SAXIFRAGACEAE (p. 118) 



GG. Leaves not fitting the above; petals 2-4; stems simple or pinnately 



branched; flowers in panicles or racemes. ONAGRACEAE (p. 156) 



GROUP 13 Dicotyledonous herbs with opposite simple 

 leaves and sympetalous corolla 



A. Ovary superior or mainly so. 

 B. Corolla regular or nearly so. 



C. Leaves markedly thick and fleshy; stamens more numerous than the lobes of 

 the corolla; pistils several, simple. CRASSULACEAE (p. 117) 



