48 THE TXDJAXA 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. 

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

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

 compound. 

 c. 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'. 

 U. 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, o* large funnel-form and ill-smelling. 



Potato Family, p. 121. 



<j(j. 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 steins rough hairy. 



Borage Family, p. 112. 

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

 mull ens and true mints of the Figwort and Mint Families). 

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

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

 posite, when crushed emitting an aromatic odor. 



Mint Family, p. 117. 

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

 4-sided; leaves mostly alternate, not aromatic. 

 /»'. Herbs with rather small flowers; stamens mostly 2 or 4 

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

 winged. Figwort Family, p. 120. 



/>•/>•. Woody vines with large trumpet-s'haped orange flowers; 

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

 on the margins of the partition separating its cells, 

 winged. TBUMPErr-OEEEPEB Family, p. 1.", 1. 



hi). 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 Plantain Family, p. 135. 



