KEY TO THE FAMILIES 
23 
b. Anthers opening by a longitudinal slit. 
Stamens 10 to many. 
Pistil one. 
Stamens many, monadelphous; fruit a capsule or the carpels 
separating at maturity. Malvaceae, p. 78. 
Stamens 8 to 16, distinct; fruit a berry. Ebenaceae, p. 124. 
Pistils 4 or 5, distinct; stamens 10... Crassulaceae, p. 84. 
Stamens 5 or fewer, inserted on the corolla. 
Pistil 1. 
Stamens as many as the lobes of the corolla and opposite them 
(Trientalis has sometimes 6 or 7 stamens). 
Primulaceae, p. 123. 
Stamens as many as or fewer than the lobes of the corolla and 
alternate with them. 
Corolla colored, not dry-scarious; fruit not opening by a lid. 
Ovary 1, 2, or 3-celled. 
Corolla 5-lobed; stamens 5. 
Style not 3-cleft; ovary 1 or 2-celled. 
Styles 2, more or less distinct; ovary 1 or 
2-celled...HYDR0PHYLLACEAE, p. 131. 
Style 1 or none; ovary 2-celled; leaves 
alternate. 
Calyx of 5 distinct or nearly distinct 
sepals; twining or trailing 
plants. 
CONVOLVULACEAE, p. 127. 
Calyx 5-toothed or -cleft; mostly erect 
plants. Solanaceae, p. 139. 
Style 3-cleft; ovary 3-celled, the flower other¬ 
wise with the parts in 5s. 
POLEMONIACEAE, p. 128. 
Corolla 4-lobed; leaves opposite, simple. 
Ovary 1 -celled; fruit a capsule; leaves opposite, 
simple, sessile.-GENTiANACEAE, p. 125. 
Ovary 2-celled; fruit a drupe; leaves petioled. 
Oleaceae, p. 125. 
Ovary 4-celled, commonly 4-lobed, splitting when ripe 
into as many nutlets; stamens 5; style 1; 
flowers in coiled spikes or racemes. 
Boraginaceae, p. 133. 
Corolla dry-scarious; capsule opening by a lid; ovary 2 or 
4-celled; stamens 2 to 4; style 1.. 
Plantaginaceae, p. 149. 
Pistils 2, (the ovaries distinct but the styles or stigmas united); 
herbs with milky juice. 
Stamens and stigmas united, the columns bearing liood-like 
appendages. ....Asclepiadaceae, p. 126. 
Stamens and stigmas not united; no hoods... Apocynaceae, p. 126. 
