256 EHINANTHACEAE. 



the floral ones with petioles as long as the flower-clusters: calyx aboi;t 2.5-3 

 mm. long; tube loosely pubescent: corolla pink or white; upper lip mostly 

 obtuse. — Common, in low sandy places^. 



5. M. piperita L. Stems 2-7 dm. tall, glabrous: leaf -blades oblong, oval, ob- 

 long-lanceolate, or oblong-ovate, 1.5-5 cm. long, sharply serrate: calyx :^.5-3 

 mm. long; lobes much shorter than the cylindric-campanulate tube: corolla 

 deep-pink, 3.5-4 nun. long. — Common, in waste places and on roadsides. Nat. 

 of Eu. — Peppermint. 



6. M. splcata L. Stems 2-5 dm. tall, glabrous or nearly so: leaf -blades ob- 

 long, elliptic, or elliptic-lanceolate, 3-6 cm. long, sharply serrate: calyx 1-1.5 

 mm. long; lobes about as long as the campanulate tube: corolla pale-pink, 

 2-2.5 mm. long. — Common, in waste places and fields. Nat. of Eu. — Spear- 

 mint. 



7. M. alopecuroides Hull. Stems 1 m. tall or less, finely retrorse-pubescent: 

 leaf-blades ovate or oval^ varying to orbicular, 2.5-9 cm. long, coarsely dentate- 

 serrate, finely pale-pubescent on both sides, rounded-truncate or subcordate at 

 the base: panicles branched, continuous, nearly 1.5 cm. thick: calyx fine- 

 pubescent, 2-2.3 mm. long; lobes subulate, about as long as the tube: corolla 

 white, 4.5-5 mm. long. — M. S. Occasional, on roadsides and in fields. Nat. 

 of Eu. > - .1^ 



27. COLLINSONIA L. Perennial erect herbs. Leaf-blades toothed. 

 Flowers in panicles. Calyx 2-lipped: upj^er lip with 3 short lobes: lower lip 

 with 2 longer lobes. Corolla 2-lipped, elongate. Stamens 2, exserted. 



1. C. canadensis L. Stems erect, 3-9 dm. tall, from a thick hard root: leaf- 

 blades thickish, oblong, elliptic, or oval, 9-16 cm. long, rather coarsely dentate- 

 serrate: calyx becoming 5-7 mm. long: corolla about 1.5 cm. long, yellowish: 

 nutlets obscurely reticulate, nearly 2 mm. in diameter. • — Common, in moist 

 woods and thickets. — Sum. — Horse-balm. Stone-root. 



28. PEEHiLA L. Annual erect herbs. Leaf -blades often coarsely toothed. 

 Flowers in spike-like panicles. Calyx 2-lipped: uper lip with 3 broad lobes: 

 lower lip with 2 longer lobes. Corolla slightly 2-lipped: upper lip broad: 

 lower lip 3-lobed, the middle lobe the largest. Stamens 4, included. 



1. P. frutescens (L.) Britton. Stems 2-6 dm. tall, minutely pubescent: leaf- 

 blades ovate or oval, 4-10 em. long, serrate or crenate-serrate : calyx 2-2.5 

 mm., becoming 6 mm. long; lower lobes lanceolate: corolla 3-3.5 mm. long, 

 white, with a ring of hairs within; lobes obtuse: nutlets prominently reticu- 

 late, nearly 1.5 mm. in diameter. — Occasional, near dwellings and on road- 

 sides. Nat. of As. — Sum. 



Family 10. RHINANTHACEAE. Figwort Family. 



Herbs, shrubs, or trees. Stems commonly terete. Leaves opposite or 

 whorled, or alternate : blades entire, toothed, or divided. Flowers perfect, 

 axillary, or spieate or racemose. Calyx regular or rarely 2-lipped, of 4 

 or 5 more or less united sepals. Corolla mostly irregular, of 4 or 5 par- 

 tially united petals. Androecium of 4, usually didynamous stamens, the 

 fifth one often represented by a staminodium. Gynoeeium 2-carpellaiy. 

 Ovary 2-eelIed. Fruit capsular or rarely baccate. 



Upper lip, or lobess, of the corolla external in the bud (except in 

 Mimulus), or wanting. 

 Leaves prevailingly alternate. 1. Veebascum. 



Leaves prevailing opposite. 



Corolla-tube with a spur or sac on the lower side near 

 the base. 



