28 KEY TO THE GENERA OF MANHATTAN PLANTS. 



numerous. (Each valve carrying 2 parietal placentae I the way from the 

 edge. Capsule solitary on a scape about 1 dm high, enclosed more or less 

 in the withered 5 lobed calyx. Seeds one-fifth mm, oblong, coat loose, 

 reticulated,) chlorophylless herbs. 



Order 86. ACANTHACEAE. 



Capsule 2-celled, loculicidally dehiscent, few seeded; va'ves sepa- 

 rating elastically. Herbs. (Seeds lenticular, supported by curved 

 stalks ) 



233 Ruellia. (Capsules nearly sessile in axillary clusters, oblanceolate, 

 I-J to 2 cm. Seeds 4 to 8, minutely hairy.) 



234. JJiunthera. (Clusters of capsules long ped uncled Capsules 1 cm. 

 Seeds 4, glabrous.) 



Order 87. PLANTAGINACEAE. 



235. Plnntago Capsules in dense spikes, 2 celled, few-seeded, circum- 

 cissilly dehiscent, partition remaining or falling away with lid. Herbs 

 with ribbed leaves, all radical. 



Order 88. RUBIACEAE. 



Calyx superior. (Fruit dry, 2-4-celled, 1 to few seeded.) Herbs or 

 s hrubs. 



236. Ccphalanthm. Fruit (5 8 mm long) in dense globose heads, " at 

 length splitting from base upwards into 2-4, 1-seeded portions." Shrubs. 



237. Houstonia. Capsules in cymes, upper portion free, loculicidally 

 dehiscent across the free portion, 2-celled (2-3 mm, 4-ribbed below. Seeds 

 few, black, oblong, pitted ) Herbs. 



238. Galium. Fruit 2-celled (dry), splitting into 2 (globose, bristly) 

 indehiscent, 1-seeded portions. Herbs with whorled leaves. 



Order 89. CAPRIFOLIACEAE. 



Fruit drupaceous (in ours). Calyx superior. Herbs or shrubs. 



239. Sambucus (Fruits in broad cymes. Stones 3. Fruit dark purple, 

 globose, 5 mm. Stones flattened, 2-edged, roughened). Shrubs. 



240. Symphoricarpos. Fruits in axillary clusters Stones 2. (Fruit 

 red, 3 to 5 mm, globose. Stones plano-convex, smooth, bony ) Shrubs. 



241. THosteum. Fruits sessile in axillary clusters, flesh becoming dry. 

 Stones 3. (Fruit yellow or orange, canescent, globular, 1 cm. Stones 

 ribbed). Herbs. 



Ouder 90. CUCURUITACEAE. 



Calyx superior. Seeds large and flat Climbing or trailing herba- 

 ceous vines. 



242. Echinocystis. Capsule inflated, weakly prickly, 2-celled, 4-seeded, 

 bursting at apex, inner portion fibrous-reticulated, (the 2 seeds in each 

 cell partially separated by a partition ) 



