DIDYNAMIA. GYMNOSPERMIA. 35 



Species. 1. O. vulgare. Indigenous. — A ^enus of 

 about \7 species almost exclusively indigenous to the Le- 

 vant; ot" these O. Toumefortii is one of the rarest and most 

 local plants in the world. 



IV2. DRACOCEPHALUM. L, (Dra.jjon's head.) 

 Cali.x subequal, 5 cleft. Orifice of the corol- 

 la inflated; upper lip concave. Stamina uncon- 

 nected. 



Herbaceous or rareh^ suffruticns?; flowers vertlcillately 

 spiked and terminal, or axillary, peduncles one or many- 

 fiowered, bracteatc; bractes broad, sometimes ciliate, in 

 most of the American species very small. 



Species. 1. D. varieg-atufn. 2. vivs^mani/m. 3- detiti- 

 culatwn. 4. * corjatum. Stoloniferous; stem and elonga- 

 ted petioles pubescent; leaves cordage, obtusely crenate, 

 upper side a little hirsute; spike unilateral; pedicells bi- 

 bracteolate; bractes of t lie rachis nearly as long as the ca- 

 . lis, broad-ovate, entire. Obs. Root creeping, perennial, 

 iibrous. Stem stoloniferous after flowering, scarcely a 

 foot hig-h, quadrangular, subpilose. Leaves about 3 or 4 

 •pair, almost as broad as lonpr. obtusely cordate, smooth be- 

 neath, petiole the length of the lamina (about an inch,) up- 

 pernr.ost pair of leaves subsessile. Bractes unusually large, 

 peduncles short and thick, mostly 1-flowered. Flowers se- 

 cund. Calix submembranaceous, nearly equal, partly 

 campanidate, segments acute, almost pungent. Corolla 

 pale blue, about an inch long, and larger than that of/?. 

 Tirg-ifiiani/m; orifice much dilated; upper lip concave, ob- 

 tuse, and e margin ate, lateral teeth of the lower lip conspi- 

 cuous; central segment rounded, pilose, and elegjmtly 

 spotted. Keccptacle of the seed large, many of the 

 seeds abortive. Hab. On the shady islands of the Oiiio, 

 about 40 miles below Pittsburgli; flowering in June. The 

 whole plants but more particularly the flower, possesses 

 an agreeable balsamic aroma, considera*bly like that of 

 the Balm of Gilead (D. caiiariense) but in an inferior de- 

 gree. 



5. * parvifiorum. Flowers verticlllate, subcapitate; 

 leaves ovate-lanceolate, deeply serrate, and p^^tio- 

 late, bractes foliaceous, ovate, ciliate, and serrate, ser- 

 ratures conspicuously mucronate; upper segment of the 

 calix much larger than, the rest; flower scarcely longer 

 than the calix. Hab. Around F'ort .Mandun, on the Mis- 

 souri; on the borders of thickets. Obs. Biennial,- nearl 



smooth, stem and petiole a little pubescent; flowers 



any 

 s al- 



