DICOTYLEDONS. 217 



calyx 4-o-cleft or parted, ofteu split to the base on one side ; 

 corolla spreading, tubular, oblique, 2-lipped, 5-lobed, the lobes 

 nearly equal and spreading ; fertile stamens 2 or 4 ; ovary 

 1-celled, but often becoming 2- or 4-celled by the intrusion of 

 the parietal placentae, style slender, stigma 2-lobed; fruit 

 a 2-valved, woody capsule beaked by 2 long and recurved 

 liornsj seeds numerous. 



MARTYNIA. 

 Characters of the family. 



M. Louisiana Mill. Unicorn Plant. Annual herbs, densely 

 viscid-pubescent ; stem stout, diffusely branched, becoming decum- 

 bent, 2-4 ft. long ; leaves round-cordate, undulate or entire ; petiole 

 long and stout ; racemes short, few-flowered ; calyx 5-cleft, with 2 or 

 4 bracts at the base; corolla H-2 in. long, whitish, tinged with yel- 

 low and purple, tube somewhat curved ; capsule 5-6 in. long, crested 

 on one side, shorter than the divergent, recurved horns. June- 

 August. In waste places. 



11 (i. acanthace;e. acaxthus family. 



Herbs ; stems usually 4-sided, often swollen between the 

 joints; leaves simjde, op])Osite, exstipulate ; flowers usually 

 axillary, i)erfect, often irregular, bracted ; calyx 4-r)-parted, 

 persistent; corolla r)-lobed, often 2-lipped; fertile stamens 2 

 or 4, insert<Ml in the tube of the corolla ; ovary free, 2-celled, 

 few- or many-seeded, style liliform, stigma entire or 2-lobed; 

 fruit a 2-celled, few-many-seeded capsule which is dehiscent 

 by 2 elastic valves, seeds globose or flattened, not winged. 



I. ruellia. 



Perennial herbs ; stems swollen at the joints and often 

 between them, somewhat 4-angled ; leaves sessile or short- 

 petioled, mostly entire ; flowers axillary, solitary or clustered, 

 showy, white, blue or purple ; calyx 2-bracted, 5-parted, the 



