URTICACBAE 289 



4-toothed, inclosing the ovary. Style subulate, villous, or stigmatic 

 on one side. Akene compressed, elliptic-ovate, invested by the 

 persistent calyx. Plants more or less hairy, but not stinging ; 

 flowers greenish. 



1. B. cylindrica, Willd. Leaves mostly opposite, lance-ovate, 

 acuminate, dentate, on long petioles ; pistillate spikes cylindrical. 

 CYLINDEIC BOEHMERIA. False Nettle. 



Perennial. Stem 2 to 3 feet high, mostly simple, obtusely 4-angled, with a groove 

 on each side. Leaves 3 to 5 inches long ; petioles 1 to 3 inches in length. Spikes 1 

 to 3 inches long, usually with 2 or 3 small leaves at the summit, the staminate 

 spikes generally longer than the pistillate ones; when the spikes are androgynous 

 they are somewhat interrupted. Fruit with a thick pubescent margin, and acu- 

 minate with the pubescent style. 

 Hob. Moist thickets; along streams: frequent. Fl. July. Fr. Sept. 



392. PARIETA V RIA, Tournef. 



[Latin, Paries, a wall ; one species often growing on old walls.] 

 Flowers polygamo-monoicous, both kinds intermixed, in axillary 

 cymose involucrate (or bracteate) dusters: STAM. FL. with a 4- 

 parted persistent calyx, and an abortive ovary. PISTILLATE (or often 

 PERFECT) FL. Calyx tubular-campanulate, 4-cleft; lobes acute, 

 keeled. Stamens (when present) incurved at first, then bending 

 back with an elastic force. Stigma subsessile, pencil-tufted. 

 Akene (or caryopsis) subcompressed, oval, smooth and shining, in- 

 closed in the persistent calyx. Leaves mostly alternate ; lobes of 

 the involucre (or bracts) sublinear, hispid-ciliate ; flowers finally 

 reddish-brown. 



1. P. Peimsj lys'aiiica, Muhl. Leaves oblong-lanceolate, rather 

 obtuse, entire, petiolate; involucre longer than the flowers. 

 PENXSYLVANIAN PARIETARIA. Pellitory. 



Annual. Stem 4 to 12 inches high, simple, or sometimes with opposite branches 

 near the base, roughish-pubescent. Leaves 1 to 2 inches long, ciliate, somewhat 

 hairy, thinnish and rough with elevated dots, tapering at base to a slender ciliate 

 petiole % an inch to % in length. Clusters of flowers sub-divided, so as to present 

 the appearance of a 2- or 3-leaved involucre to each flower. 

 Hob. Banks of Schuylkill: rare. FL May. Fr. July. 



SUB-CLASS II. 



GYMNOSP^RMOUS EXO'GENOUS PLANTS. 



Pistil represented by an open scale (or carpellary leaf) or sometimes 

 entirely wanting, the ovules, and seeds, consequently naked (i. e. 

 without a proper pericarp) ; of course, there is neither style nor 

 stigma, and the pollen is applied immediately to the ovules; coty- 

 ledons often more than two. 



ORDER XCVin. CONIF'ERAE. 



Trees, or shrubs, with resinous juice ; leaves fascicled (by reason of the suppression 

 of branches, or internodes), or scattered, mostly linear, needle-shaped, or subulate, 

 and evergreen ; flowers monoicous, or dioicous, usually amentaceous and destitute 

 of both calyx and corotta ; staminate flowers consisting of one or more (often mona- 

 dclphous) stamens, arranged in a kind of loose ament; anthers mostly covered at 



