48 THE INDIANA WEED BOOK. 



d. Stamens distinct ; pollen in ordinary grains ; follicles very slen- 



der, cylindrical, pointed. DOGBANE FAMILY, p. 104. 



dd. Stamens united by their filaments to form a tube; pollen 

 grains united into waxy masses; follicles robust. 



MILKWEED FAMILY, p. 105. 



cc. Stems and leaves without milky juice; fruit not a follicle; seeds 

 without tufts of hairs ; leaves opposite or alternate ; ovary 1, 

 compound. 



e. Corolla regular (slightly irregular in blueweed of the Borage 



Family). 

 /. Ovary not deeply 4-lobed; fruits not separating as 1-seeded 



nutlets when ripe. 



g. Stamens 5; flowers not in terminal spikes; leaves alter- 

 nate. 

 h. Twining or trailing vines ; fruit not a berry or a large 



prickly capsule. 



i. Stems white or yellowish, leafless, twining, para- 

 sitic vines. DODDER FAMILY, p. 110. 

 ii. Stems green, leaf-bearing vines; flowers of our 

 weeds large, funnel-form or bell-shaped. 



MORNING-GLORY FAMILY, p. 107. 



hh. Erect and branching herbs, not vines; fruit a berry 

 or a large prickly capsule ; corolla either bell- or 

 wheel-shaped, or large funnel-form and ill-smelling. 



POTATO FAMILY, p. 124. 



gg. Stamens 4, 2 long, 2 short; flowers of our weeds white 



or blue in erect spikes terminating the stems or 



branches ; leaves opposite. VERVAIN FAMILY, p. 115. 



//. Ovary deeply 4-lobed around the style; fruit separating as 



nutlets, those in our weeds mostly armed with barbed 



prickles; leaves and stems rough hairy. 



BORAGE FAMILY, p. 112. 



ee. Corolla irregular, more or less 2-lipped (nearly regular in the 

 mullens and true mints of the Figwort and Mint Families). 

 j. Ovary 4-lobed around the style, the lobes ripening into 

 smooth 1-seeded nutlets; stem 4-sided; leaves simple, op- 

 posite, when crushed emitting an aromatic odor. 



MINT FAMILY, p. 117. 

 jj. Ovary 2-celled; fruit a many-seeded capsule; stems rarely 



4-sided; leaves mostly alternate, not aromatic, 

 fc. Herbs with rather small flowers; stamens mostly 2 or 4 

 (5 in the mullens) ; seeds borne on a central axis, not 

 winged. FIGWORT FAMILY, p. 129. 



Ick. Woody vines with large trumpet-shaped orange flowers; 

 stamens 5; fruit a long pod-like capsule; seeds borne 

 on the margins of the partition separating its cells, 

 winged. TRUMPET-CREEPER FAMILY, p. 134. 



66. Corolla thin, dry and membranous, withering on the pod; leaves 

 of our weeds all basal; flowers in dense spikes on slender leaf- 

 less flower stalks. Pi ANTAIN FAMILY, p. 135. 



