Vol. III.] 



MINT FAMILY. 



123 



36. COLLINSONIA L. Sp. PI. 28. 1753. 



Tall perennial aromatic herbs, with large membranous petioled leaves, and terminal 

 loose panicled racemes of small yellowish mostly opposite flowers. Calyx campanulate, 

 short, 10-nerved, 2-lipped, declined in fruit, usually pubescent in the throat; upper lip 

 3-toothed; lower 2-cleft. Corolla much longer than the calyx, obliquely campanulate, 

 5-lobed, 4 of the lobes nearly equal, the 5th pendent or declined, fimbriate or lacerate, much 

 larger, appearing like a lower lip. Anther-bearing stamens 2, not declined, much exserted, 

 coiled before anthesis; bases of the filaments connected by a woolly ring; anthers 2-celled, 

 or the sacs at length partially confluent. Ovary deeply 4-parted. Nutlets smooth, globose. 

 [Named for Peter Collinson, 1693-1768, an English botanist, and correspondent of Linnaeus.] 



Two or 3 species, natives of eastern North America. 



i. Collinsonia Canadensis L,. Horse-balm. Citronella. Rich-weed. 



(Fig. 3186.) 



Collinsonia Canadensis L. Sp. PI. 28. 1753. 

 Stem stout, erect or ascending, branch- 

 ed, 2-5 high, glabrous, or glandular- 

 pubescent above. Leaves ovate or ovate- 

 oblong, acuminate at the apex, narrowed, 

 obtuse or sometimes cordate at the base, 

 the lower slender-petioled, 6 / -io / long, 

 the upper nearly sessile, much smaller, 

 all coarsely dentate; racemes numerous, 

 in terminal panicles sometimes i long; 

 pedicels ascending, 3 // -6 // long in fruit, 

 subulate-bracteolate at the base; flowers 

 lemon-scented; calyx-teeth subulate, those 

 of the lower lip much longer than those 

 of the upper; corolla light yellow, 5 // -7 // 

 long; anther-bearing stamens 2, the upper 

 pair rudimentary; fruiting calyx promi- 

 nently ribbed, 3 // -4 // long. 



In moist woods, Maine and Ontario to Wis- 

 consin, south to Florida and Kansas. Root 

 large, thick, woody. Called also Horse-weed 

 and Stone-root. July-Oct. 



37. PERILLA Ard.; L. Gen. PI. Ed. 6, Add. 578. 1764. 



Annual herbs, with petioled purple or discolored leaves, and small flowers in loose 

 bracted racemes. Calyx campanulate, 10-nerved, 5 cleft, nearly regular in flower, enlarging, 

 declined and becoming 2-lipped in fruit, the upper lip 3-toothed, the lower 2-cleft, the throat 

 not bearded. Corolla-tube not longer than the calyx, the throat obliquely campanulate, the 

 limb 5-cleft, the lower lobe slightly the larger. Stamens 4, nearly equal, or the posterior 

 pair shorter, erect, divergent; anthers 2-celled. Style deeply 2-cleft; ovary 4-parted. Nut- 

 lets globose, reticulated. [The native name in India.] 



One or 2 species, natives of Asia. 



i. Perilla frutescens (L.) Britton. 

 Perilla. (Fig. 3187.) 



Oct mum frutescens L. Sp. PL 597. 1753. 

 Perilla ocimoides L. Gen. Ed. 6, Add. 578. 1764. 

 Perilla frutescens Britton, Mem. Torr. Club, 5: 

 277. 1894. 



Purple or purple-green, sparingly pubes- 

 cent; stem stout, erect, much branched, 

 i-3 high, leafy. Leaves long-petioled, 

 broadly ovate, acuminate at the apex, nar- 

 rowed at the base, coarsely dentate, 3 / -6 / 

 long and nearly as wide; racemes terminal 

 and axillary, many-flowered, 3 / -6 / long; 

 pedicels spreading, i)4 // -2 // long in fruit; 

 calyx minute in flower, much enlarged, 

 gibbous at the base and densely pilose-pu- 

 bescent in fruit; corolla purple or white, 

 \%" long, with a woolly ring within. 



In waste places, escaped from gardens, south- 

 ern New York to Illinois. Native of India. 

 July-Oct. 



