DIDYXAMIA. GYMXOSPERMIA. 27 



K genus of about 25 sjiecies almost exclusively Euro- 

 pean, yet extendi ug- to India and the Cupe of Good Hope. 



597. ISANllIUS. Mlchcmx. 



Cdlix suhcampamilate. Corolla S-partcd; 

 inhe straight and narr<<w; segments of the bor- 

 der ovate and e<jiial. Stamina subequal. Stig- 

 mas linear, recurved. 



Annual, covered with a viscid pube<^ccnce, leaves en- 

 lire, longitudinally nerved, flowers axillary and peduncu- 

 late, greyish-blue, calix becoming aeruginous. 



Species. 1. T. c<tnileiia. Trichostema brachiata. L. 

 Hab.^ In Pennsylvania, JNlaryland and Virginia, but more 

 abundant west of the mountains, from wiicticc it appears 

 to have originally propagated along the Ohio and Xhi- Aiis- 

 sissippi as well as pari of the Missouri. — 'I'iie only spe- 

 cies. Seeds reticulately rugns^: as in Triehost€7na ip 

 which this genus is soniewhat allied. 



398. HYSSOPUS. L. (Hysop.) 



Lower lip of the Corolla 3-parted, interme- 

 diate segnaent subcrenate. Stamina straight, 

 and distant. 



A very unnatural genus of about 5 or 6 species; flowers 

 in // officinalis axillary and verticiliate; corolla in H. Lo- 

 phanthus resupinate with the flowers partly cymose; the 

 Americiin species scarcely distinct from J\epeta, are tall 

 plants with cordate-ovate toothed leaves, and dense ter- 

 minal verticillated spikes, with white or pale blue flowers. 



Species. 1. If. nepetoides. Rractes dilated; calix 

 smooth, segments linear. 2. scrophulari.efolius. Bractes 

 ovate acute; calix smooth, segments subuvate. o. * ani- 

 i-atus. Smooth; spikes verticiliate interrupted; leaves cor- 

 date-ovate, angularly toothed, undc^r side glaucous; calix 

 equal, acute,pubesccnt, segments siibovate, about one third 

 the length otthe calix; bnctes scarcely as long as thepe- 

 dicells. Stachj/s Faeniaihim, Ph. Hab. On the plains of 

 the Missouri near Fort Maiulan, on the borders of thick- 

 ets. Obs. 2 or 3 feet high, very smooth; leaves petio- 

 late, about an inch long, acute, no where tomentose, but 

 whitish or glaucous on the under side and covered with 

 resinous punctures, Miiich when bruised emit an agree- 

 able aniseed odor; spikes short aiid interrnpled; flowers 



