io6 



LABIATAE. 



[Vol.. III. 



About 15 species, natives of America. Besides the following, some 8 others occur in the south- 

 ern and southwestern States. Sometimes called Mock Pennyroyal. 



Teeth of the upper lip of the calyx triangular; leaves serrate. 1. H. pulegioides. 



Teeth of both lips of the calyx subulate; leaves entire. 



Calyx-teeth all nearly equal; annual. 2. H. hispida. 



Teeth of the lower lip nearly twice as long as the upper; perennial. 3. H. Drummondii. 



i. Hedeoma pulegioides (L,.) Pers. American Pennyroyal. (Fig. 3141.) 



Melissa pulegioides L. Sp. PI. 593. 1753. 

 Cunila pulegioides L. Sp. PI. Ed. 2, 30. 1762. 

 Hedeoma pulegioides Pers. Syn. 2: 131. 1807. 



Annual; stem very slender, erect, much branched, 

 finely soft-pubescent, 6 / -i8 / high, the branches as- 

 cending. Leaves ovate to obovate-oblong, petioled, 

 sparingly serrate, mostly obtuse at the apex and nar- 

 rowed at the base, glabrous, or sparingly pubescent, 

 thin, Yz'-T-Yi.' long, 2 // -8 // wide, the upper smaller; 

 clusters few-flowered, axillary, rather loose; pedicels 

 pubescent, shorter than or equalling the calyx; calyx 

 pubescent, gibbous, oblong-ovoid in fruit, its 3 upper 

 teeth triangular, acute, not exceeding the 2 subu- 

 late hispid lower ones; corolla purple, about 3" long; 

 rudimentary stamens manifest, capitate at the sum- 

 mit, or rarely anther-bearing. 



In dry fields, Cape Breton Island to Ontario and Min- 

 nesota, south to Florida and Nebraska. Also called 

 Tick-weed and Squaw-mint. July-Sept. 



2. Hedeoma hispida Pursh. Rough Pennyroyal. (Fig. 3142.) 



Hedeoma hispida Pursh, Fl. Am. Sept. 414. 1814. 

 Hedeoma hirta Nutt. Gen. 1: 16. 1818. 



Annual; stem erect, branched, slender, 3 / -S / 

 high, pubescent, the branches erect-ascending, very 

 leafy and copiously flowered. Leaves linear, entire, 

 firm, sessile, or the lower short-petioled, blunt or 

 subacute at the apex, narrowed at the base, more or 

 less hispid-ciliate but otherwise mostly glabrous, 

 Yz'-\ f long, about 1" wide, the lower much shorter 

 and smaller; clusters axillary, numerous, crowded, 

 several-flowered; pedicels pubescent, shorter than 

 the calyx; bracts subulate, very hispid, about 

 equalling the calyx; calyx oblong, gibbous, hispid, 

 its teeth all subulate, nearly equal in length, up- 

 wardly curved in fruit, about one-half as long as 

 the tube, the 2 lower ones somewhat narrower and 

 more hispid than the upper; corolla about 3 // long, 

 bluish-purple; sterile stamens rudimentary or none. 



On drv plains, Illinois to the Northwest Territory, 

 Louisiana, Arkansas and Colorado. May-Aug. 



3. Hedeoma Drummondii Beuth. Drum- 

 mond's Pennyroyal. (Fig. 3143.) 



H. Drummondii Benth. I,ab. Gen. & Sp. 368. 1834. 

 H ciliata Nutt. Journ. Acad. Phila. (II.) 1: 183. 1847. 



Perennial from a woody base, with an ashy down 

 nearly all over; stems much branched, slender, erect, 

 6 / -i8 / high, the branches ascending. Leaves oblong 

 or linear, entire short-petioled or sessile, obtuse at 

 the apex, narrowed at the base, 5 // -io // long, \"-2.%, ,f 

 wide, the lowest shorter; clusters axillary, loosely 

 few-flowered; pedicels puberulent, about one-half as 

 long as the calyx and equalling or longer than the 

 subulate bracts; calyx cylindric oblong, hirsute, 

 slightly gibbous, its teeth all subulate, upwardly 

 curved and connivent in fruit, the 2 lower nearly 

 twice as long as the 3 upper; corolla purple, 4 // -6 // 

 long; sterile stamens rudimentary or none. 



In dry soil, Nebraska and Colorado to Texas, Arizona 

 and northern Mexico. April-Aug. 



