DIDYNAMTA. GYMNOSPERMIA. S9 



A considerable genus, chiefly indig-enous to the south 

 of Europe, but extending into Barbary and the Levant. 



418. CALAMINTHA. Tourncfort. 



Calix after flowering closed with villous 

 hairs. Orifice of the corolla somewhat inflated, 

 upper lip emarginate; lower 3-parted, interme- 

 diate segment entire, subcniarginate or crenu- 

 late. 



Herbaceous or suffruticose; peduncles many flowered. 



Species. 1. C- J\epeta. 2. cavoliidana. Thymus caro- 

 Uniarius. Mich. 2. p. 9. Suffruticoiie: Jeaves lanceolate- 

 ovate, entire, smooili and opaque; niai-gin partly revolute; 

 verticills many-flowered, subpeduncidate; upper Up of 

 the calix 3-toothed, obtuse. — v. v. A few miles from Au- 

 gusta in Georgia. Bractes obsolete; calix closed with a 

 tomentose villus; leaves sometimes partly oval. The 

 Thymbra cnroUniana of Waller, according to the observa- 

 tions of Mr. Llliott, constitutes a new and distinct genus. 



A^ small genus almost exclusively indigenous to the 

 south of Europe. 



419. TRICHOSTEMA. L, 



Calix resupiiiate. Upper iip of the corolla 

 falcate. Stamina very long and incurved. 



Annual; decussately brancht-d; flowers solitary, each 

 bibracteate, at length developed in dichotomous panicles-, 

 blue, sometimes white. — Seeds rugose. Aroma of tlie 

 whole plant, balsamic, not pungent, very similar to that 

 of Isanthus. 



Species. 1. T. dichoto;jia. Leaves oblong-ovate, at- 

 tenuated towards the base, pubescent; stamina very long. 

 2. *li7iecms. Leaves linear, smooth, sessile, attenuated 

 somewhat at either end, dentures of the calix conspicu- 

 ously awned, stamina very long. Hab. With the above 

 in the sandy fields of New Jersc}', also in the vicinity of 

 Philadelpiiia, in arid situations. After repeated compari- 

 sons I am perfectly satisfied of the specitic distinction of 

 this plant, considered as a variety of the preceding by 

 Mr. Pursh; it is much rarer, and always smaller. The 

 leaves are invariably smooth and rather thick, while the 

 rest of the plant is covered with a viscid pubescence. 3. 

 brachiata. See Isanthus. 



Of this genus there is another species in Cochinchina. 



