MOi^^OPETALOUS EXOGENOUS PLANTS. 407 



C. Americana, L. Branches and leaves scurfy ; leaves 

 ovate-oblong, acute at each end, crenate, serrate, rough 

 above, hoary beneath, becoming smoothish ; cymes many- 

 flowered, as long as the petioles ; corolla blue ; drupe ^\xv- 

 li[e,—Shrub, 3°-S° high; leaves 4"-6" long. On Buffalo 

 Bayou. 



PHRYMA, L. LOPSEED. 



Perennial, branching pubescent herbs, with opposite, 

 ovate or oblong, coarsely-serrate, long-petioled leaves, and 

 small opposite pui-plish^ower^, in a slender terminal spike; 

 fruit reflexed, oblong, pointed by the persistent style; 

 calyx tubular, bilabiate, the upper lip notched, the lower 

 longer, 3-lobed ; stamens 4, didynamous, included ; style 

 slender ; stigm,a 2-cleft. 



P. LEPTOSTACHYA. Stem l°-3° high, tumid above the 

 joints; leaves 3-5' long. 



87. MINT FAMILY. Order, Labiate. 



Herbs or shrubs, with opposite 4-angled bra^iches, and 

 opposite exstipulate leaves', flowers opposite, solitary, or 

 oftener in close axillary spiked or capitate cymes (whorls) ; 

 calyx 3-10-cleft or toothed ; corolla more or less bilabiate, 

 4-5-lobed; stamens inserted on the tube of the corolla, di- 

 androus or did3'namous ; ovary 4-cleft or 4-parted, the lobes 

 surrounding the base of the single style ; ovule solitary, 

 erect, anatropous ; fruit of 1-4 one-seeded nutlets ; albumen 

 scarce or none; embryo straight or (in Scutellaria) curved; 

 radicle short, inferior. — Plants commonly dotted with mi- 

 nute glands, which are filled with an aromatic volatile oil. 



SYNOPSIS. 

 Tribe I. Ocimoideae. Stamens 4, didynamous ; the 



