KEY TO THE GENERA OF MANHATTAN PLANTS. 25 



Order 73. ASCLEPIADACEAE. 



Follicles 2, (fusiform). Seeds numerous (comose). Herbs. 



Order 74. CONVOLVULACEAE. 



Capsule mostly 2 celled and 4-seeded or less, (3-celled and 6-seeded 

 in Ipomoea hedcracea). Twining, trailing or erect herbs. 



189. Ipomoea, Calyx not bracteate at base. Capsule globose, 2-4- 

 valved. (1 cm or more long.) 



190. Convolvulus. As in Ipomoea but calyx with 2 large bracts at base. 

 191 Emlvulus. (Capsule 3-4 mrn long, 2-4-valved. Erect herb.) 



Order 75. CUSCUTACEAE. 



192. Cuscuta. Parasitic, orange- colored , twining herbs. (Capsule 

 very thin and papery, indehiscent, breaking away irregularly, 2-3 mm 

 high ) 



Order 76. POLE MONI ACE AE. 



193. Phlox. Capsule 3-celled, loculicidally 3-valved, 3-seeded (calyx 

 lobes long-acuminate, persistent. Capsule globular, smooth, 5 mm long). 

 Herbs 



Order 77. IIY"DROPHYLLACEAE. 



194. Macrocalyx. Capsule 1 -celled, 2-valved, with 2 much enlarged 

 parietal placentae, 4-seeded. Calyx enlarged, 5-angled. Herbs. 



Order 78. BORRAGINACEAE. 



Fruit (in ours) deeply 4-lobed, separating into 4 indehiscent, 1- 

 seeded nutlets. Leaves alternate. Herbs. 



195. Cynoglossum. Nutlets armed all over the back with barbed 

 prickles. 



196 Lappula. Nutlets armed (along the margin with 1 row of barbed 

 prickles.) 



197. Lithospermum. Nutlets bony (smooth and glossy ,sometimes wrink- 

 led, acutish), often less than 4 maturing, scar basal. 



198. Onosmodium. Nutlets much as in Lithospermum. (Plant bristly- 

 hairy, i to H M high. Leaves oblong. Nutlets pearly white.) 



Order 79. VERBENACEAE. 



(Fruit dry, notlobed, separating into 2-4 indehiscent, 1-seeded nut- 

 lets. Herbs with opposite leaves.) 



199. Verbena. Fruits in terminal spikes, enclosed in the 5-toothed 

 calyx, separating into 4 nutlets. (Nutlets oblong, 4-sided, 2 sides occu- 

 pied by the scar.) 



200. Lippia. Fruits in short, long-peduncled axillary spikes. (Calyx 

 2-lipped, 2-edged.) 



