LAB I A TAE. 807 



36. COLLINSONIA L. 



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

 terminal loose panicled racemes of small yellowish mostly opposite flowers. Calyx 

 campanulate, short, io-nerved, 2-lipped, declined in fruit, usually pubescent in the 

 throat ; upper lip 3-toothed ; lower 2-cleft. Corolla longer than the calyx, 

 obliquely campanulate, 5-lobed, 4 of the lobes nearly equal, the 5th pendent or de- 

 clined, 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 par- 

 tially confluent. Nutlets smooth, globose. [Named for Peter Collinson. 1693- 

 1768, an English botanist, and correspondent of Linnaeus.] Two or 3 species of 

 eastern N. Am. 



i. Collinsonia Canadensis L. HORSE-BALM. CITRONELLA. RICH-WEED. 

 (I. F. f. 3186.) Stem 6-15 dm. high, glabrous, or glandular-pubescent above. 

 Leaves ovate or ovate-oblong, acuminate, the lower slender-petioled, 1.5-2.5 dm. 

 long, the upper nearly sessile, much smaller, all coarsely dentate ; terminal pani- 

 cles sometimes 3 dm. long ; pedicels ascending, 612 mm. 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, 1-1.5 cm. long; 

 fruiting calyx prominently ribbed, 6-8 mm. long. In moist woods, Me. and Ont. 

 to Wis., Fla. and Kans. Root large, thick, woody. July-Oct. 



37. PERILLA Ard. 



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

 loose bracted racemes. Calyx campanulate, io-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. Nutlets globose, reticulated. [The native name in India.] One 

 or 2 species, natives of Asia. 



i. Perilla frutescens (L.) Britton. PERILLA. (I. F. f. 3187.) Sparingly 

 pubescent, 3-9 dm. high. Leaves long-petioled, broadly ovate, acuminate, coarsely 

 dentate, 7-15 cm. long and nearly as wide ; racemes terminal and axillary, many- 

 flowered. 7-15 cm. long ; pedicels 3-6 mm. long in fruit ; calyx minute in flower, 

 much enlarged, gibbous at the base and densely pilose-pubescent in fruit ; corolla 

 purple or white, 3 mm. long, with a woolly ring within. In waste places, escaped 

 from gardens, N. Y. to 111. Native of India. July-Oct. 



Perilla frutescens Nankin^nsis (Lour.) Britton. Leaves crisped and incised. Es- 

 caped from gardens, N. J. to W. Va. 



38. ELSHOLTZIA Willd. 



Herbs, with thin leaves, and small or minute clustered flowers, in terminal 

 bracted spikes. Calyx campanulate or ovoid, lo-nerved, enlarging in fruit, not 

 bearded in the throat, 5 -toothed, the teeth nearly equal. Corolla-tube little longer 

 than the calyx, the limb oblique, or slightly 2-lipped, 4-lobed ; upper lobe erect, 

 concave, emarginate, the 3 others spreading. Anthers 2-celled, or the sacs more 

 or less confluent. Nutlets ovoid or oblong. [Named in honor of J. S. Elsholtz, a 

 Prussian botanist.] About 20 species, natives of Asia. 



i. Elsholtzia Patrinii (Lepech.) Kuntze. ELSHOLTZIA. (I. F. f. 3188.) 

 Annual, glabrous or nearly so ; stems erect or ascending, 3-6 dm. high. Leaves 

 long-petioled, ovate or oblong, acute or acuminate, crenate-dentate, 2-8 cm. long ; 

 spikes dense, about 12 mm. thick ; flowers several in the axils of each of the 

 broadly ovate membranous reticulated mucronate bracts ; calyx hirsute, shorter 

 than the bract ; corolla 2 mm. long, pale purple. Notre Dame du Lac, Temis- 

 couata Co., Quebec. Nat. from Asia. July- Aug. 



