ASCLEPIADACEAE. 
979 
Corolla plaited and the plaits convolute in the bud; flowers axillary, 
solitary or cymose-conglomerate; plants usually twining. 
II2. CONVOLVULACEAE. 
Corolla merely convolute in the bud, not plaited; flowers cymose; 
plants never twining. 113. Polemoniaceae. 
Inflorescence more or less distinctly scorpoid ; ovary in ours i-celled or 
imperfectly 2-celled ; micropyle of the seed turned upwards. 
114. Hydroleaceae. 
Styles and stigmas wholly united. 
Ovules few. 
Ovules numerous. 
Median axis of the gynoecium 
stem ; seeds mostly pitted. 
Median axis of the gynoecium not in the 
stem; seed tuberculated (Verb as cum ). 
I 12. CONVOLVULACEAE. 
in the same plane as the axis of the 
119. Solanaceae. 
same plane as the axis of the 
120. Rhinanthaceae. 
Fruit of 1-4 nutlets (in all our genera) ; ovary more or less distinctly 4-lobed. 
115. 
116. 
11 7 . 
118. 
120. 
121. 
Heliotropaceae. 
Boraginaceae. 
Style or stigma furnished with a glandular ring. 
Style or stigma not furnished with a glandular ring, 
Stamens 4 and didynamous, or 2 or 1. 
Carpels ripening into 4 nutlets, an achene or a drupe. 
Style apical on the lobeless ovary. 
Style arising between the 4 lobes of the ovary. 
Carpels ripening into a capsule. 
Placentae of the ovary axile. 
Ovary 2-celled, rarely 3-5-celled ; land-plants. 
Ovary 1-celled; ours submerged water-plants. 
Placentae of the ovary parietal. 
Heidis parasitic on the roots of other plants; leaves scale-like, not green. 
122. Orobanchaceae. 
Herbs with green leaves; not parasitic. 123. Martyniaceae. 
Verbenaceae. 
Laminaceae. 
Rhinanthaceae. 
Pin guiculaceae. 
Family iii. CUSCUTACEAE Dumont. Dodder Family. 
1. CUSCUTA L. Dodder. 
Styles equal with elongated stigmas. 1. C. epithymum. 
Styles unequal; stigma capitate. 
Capsules circumscissile; calyx- and corolla-lobes acuminate; inflorescence um¬ 
bel-like. 2. C. umbellata. 
Capsule indehiscent or bursting irregularly. 
Calyx gamosepalous, usually not bracted. 
Corolla-lobes not incurved. 
Scales of the corolla incurved upon the ovary ; styles about half as long 
as the ovary or longer. 3. C. Gronovii. 
Scales of the corolla appressed to the corolla-tube ; styles Va-Vz as long 
as the ovary. 4. C. curta. 
Corolla-lobes incurved at the apex. 
Capsule 4 mm. or less broad ; inflorescence rather open. 
5. C. indecora. 
Capsule 5-6 mm. broad ; inflorescence globular clusters. 
6 . C. megalocarpa. 
Calyx of 5 almost distinct and overlapping sepals, subtended by 2 or more 
similar bracts. 7. C. cuspidate. 
1. Cuscuta epithymum L. On clover, alfalfa, etc.; introduced from Eu¬ 
rope.—Ft. Collins. 
2. Cuscuta umbellata H. B. K. On low herbs, especially on Portulaca, 
from Colo, to Tex. and Ariz.; also in Mex.—Hovenweep Canon ( Brandegee ). 
3. Cuscuta Gronovii Willd. On low shrubs and coarse herbs from N. S. 
and Man. to Fla., Tex. and Colo.—Manitou. 
