248 MINT FAMILY. 



11. CITirtLA, DITTANY. (An old Latin name of unknown meaning.) 



C Marina, Maryland I). Dry hills through the Middle States ; nearly 

 smooth, 1 ° high, corymbosely much branched, with ovate or heart-shaped almost 

 sessile serrate leaves (I' long), and peduncled loose cymes of purplish flowers, in 

 summer. Jf. 



12. HEDEOMA. (Formed from a Greek name of a sort of Mint, refers to 

 the sweet scent. ) Low and fragrant-scented, growing in dry and open or sterile 

 grounds, with small flowers in loose axillary clusters, all summer. 



H. pulegioldes, Amehican Pennteoyal, the pungent aromatic scent 

 and taste being like that of the English Pennyroyal or Mentha Pulegium of Eu. ; 

 ,very common, 5' - 8' high, hairy, branching, with oblong-ovate petioled leaves, 

 few flowered chisters, and bluish corolla scarcely exceeding the calyx. ® 



H. hispida, is common from Western Illinois S. W. ; 2' - 5' high, hairy, 

 with sessile linear entire leaves, and bristly-ciliate calyx. (T) 



13. COLLINSONIA, HORSE-BALM. (Named for Peter Collinson of 

 London, who corresponded with Bartram and Linnseus.) Bather tall and 

 large-leaved strong-scented plants : fl. summer, y. 



C. Canadensis, also called Rich-weed and Stone-boot, the only com- 

 mon species, in rich moist woods ; smooth, 2° - 3° high, with ovate serrate 

 leaves 3' - 6' long apd on long petioles, and pale yellow lemon-scented flowers 

 on slender pedicels in panicled racemes. 



14. HYSSOPtrS, HYSSOPl (The ancient Greek name of the plant, from 

 the Hebrew. ) 2/ 



H. officinalis, the only species, cult, in gardens from the Old World, 

 rarely running wild : smooth tufted simple stems or branches 2° high ; leaves 

 lance-linear and entire ; small clusters of blue flowers crowded iu a terminal 

 spike, in summer. 



15. PYCNANTHEMUM, MOUNTAIN MINT or BASIL. (Nams 

 from Greek, means dense flower-clusters. ) Several species, all aromatic-scented, 

 1° - 3° high, in open usually gravelly or sandy soil ; flowers with pale corolla 

 often purple-dotted, in late summer and autumn. % Only the following 

 widely common. 



P. ineinum. Leaves petioled, ovate or oblong, remotely toothed, finely 

 noft-downy above and white-hoary beneath, those next the open flat cymes 

 whitened both sides ; bracts and calyx-teeth somewhat awn-pointed. 



P. mtltieum. Minutely sof(>downy but hardly whitened, rather low, 

 bushy-branched ; leaves mostly lance-ovate and sessile, with rounded or slightly 

 heartshaped base, minutely sharp-toothed, rather rigid; flowers in heads or 

 dense clusters ; calyx-teeth and inner bracts rather blunt. 



P. pUbsuin. Only from W. Penn. W., is downy with rather long soft 

 hairs ; the broadish lanceolate leaves acute at both ends and nearly entire ; 

 whorled heads at the end of the branches ; the calyx-teeth and bracts ovate- 

 lanceolate and acute. 



P. arist^ltum. Only from New Jersey S., in pine-barrens : minutely sof^ 

 pubescent ; leaves lance-oblong or broadly linear, rigid, almost entire ; flowers 

 in heads, with the narrow and awn-pointed bracts and calyx-teeth as long as the 

 corolla. 



P. lanceolktum. Smoothish, not hoary, very leafy, bushy branched; 

 leaves small and clustered, narrow lanceolate or lance-linear, rigid, sessile, ob- 

 tuse at base ; flowers small, in numerous globular close heads which are crowded 

 in terminal corymbs ; calyx-teeth and bracts short, triangular ; lips of the 

 corolla very short. 



P. linifdlium. Like the last, less common N. : smoother, with lance 

 linear leaves, and narrower sharp-pointed bracts and calyx-teeth. 



