750 LAMIACEAE 



Calyx-teeth about equal in length; bracts spreading or reflexed, hispid-ciliate. 



1. //. hispida. 

 Calyx-teeth of the iower lip much longer than those of the upper; bracts mostly erect, 

 cinereous-luspidulous. 

 Corolla 10-12 mm. long, more than half longer than the calyx. 2. H. camporum. 



CoroUa 6-8 mm. long, slightly exceeding the calyx. 



Floral leaves longer than the subtended calyces; plant 1.5-4 dm. liigh. 



3. H. sancta. 

 Floral leaves scarcely exceeding the subtended calyces; plant 1-1.5 dm. high. 

 Leaf-blades oval or elliptic, distinctlj petioled. 4. //. thymoides. 



Blades of the floral leaves oblong to linear. 5. H. ovata. 



1. H. hispida Pursh. Annual; stem 1-2 dm. high, hispidulous ; leaves 

 linear, entire, thickish, hispid-ciliate; upper calyx-teeth subulate, the lower more 

 aristiform, equalling the bluish corolla, 6 mm. long. Sandy soil: Sask. — Wis. — 

 Ky.— Colo.— Alta. Plain. My-Jl. 



2. H. camporum Rydb. Perennial, with a slender taproot; stems branched 

 at the base, decimibent or ascending, finely puberulent; leaves spreading, linear- 

 lanceolate, lanceolate, or oblong, 1-2 cm. long, grayish-puberulent, subsessile; 

 calyx 7-8 mm. long, somewhat saccate below; teeth subulate, the lower 2 mm., 

 the upper 1 mm. long; corolla puberulent, with an ample limb. H. longiflora 

 Rydb., not Briq. Canons: S.D. — Ivans. Plain. 



3. H. sancta Small. Annual or perennial; stem erect, branched, cinereous- 

 puberulent; leaf -blades oval, oblong, or linear-oblong, 1-1.5 cm. long, entire, 

 slightly revolute, short-petioled; calyx 5-6 mm. long, hispidulous; tube some- 

 what saccate; lobes subulate, the lower about twice as long as the upper; coroUa 

 puberulent. Dry plains: Tex. — Colo. — N.M. Plain — Submont. Ap-Jl. 



4. H. thymoides A. Gray. Perennial, with a taproot; stem branched at 

 the base, finely puberulent; leaf -blades ovate or elliptic, 6-10 mm. long, short- 

 petioled, canescent-puberulent ; calyx about 5 mm. long, hispidulous; teeth 

 subulate, the lower slightly longer than the upper; corolla 6-7 mm. long. H. 

 nana Rydb., in part. Mountain sides: N.M. — Colo. — Utah — Ariz. Son. — 

 Submont. Ap. 



5. H. ovata A. Nels. Perennial, with a taproot; stem branched at the base, 

 divaricate, puberulent, 1-2 dm. high; blades of lower leaves oval or elliptic, 

 7-15 mm. long; floral leaves linear; calyx about 5 mm. long; lower teeth a little 

 longer than the upper; coroUa barely exceeding the calyx. H. Drummondii 

 Coult., in part. H. nana Rydb., in part. Hills: Mont. — Colo. — Utah. Sub- 

 mont. Je-Jl. 



23. CLINOPODIUM L. B.vsil. 



Annual or perennial herbs or rarely shrubs. Leaves opposite, entire or 

 toothed, narrow or broad. Flowers in ours in dense axillary clusters subtended 

 by linear-filiform bracts. Calyx 13-ribbed, often swollen at the base; upper lip 

 with 3 short lobes; lower li]3 with 2 longer lobes. CoroUa 2-Upped, abruptly 

 oilated at the throat; upper lip erect; lower lij) spreading, 3-lobed. Stamens 4, 

 all anther-bearing; anther 2-celled, awnless. Nutlets smooth. 



1. C. vulgare L. Perennial, with a rootstock; stem 1-5 dm. high, simple or 

 nearly so, s]>aringly hairy; leaf-blades oval or ovate, 1-4 cm. long, obtuse, undu- 

 late or crenate; calyx 8-9 mm. long, villous-hirsute, ribbed; lobes subulate-aris- 

 tate; corolla white or purple, 10-12 mm. long. Thickets and waste places: N.S. 

 — N.C. — Colo. — Man.; nat. or adv. from Eu. Plain — Mont. Je-Au. 



24. MADRONELLA Greene. False Horse-mint, Western 

 Pennyroyal, Mustang Mint. 



Aromatic caulescent perennials. Leaves mostly short-petioled, opposite, 

 entire or dentate. Flowers perfect, in dense terminal or axillary verticillate 

 heads, subtended by broad membranous or colored bracts. Calyx tubular, nar- 

 row, 15-nerved, with 5 equal teeth. Corolla 2-lii)ped; upper lip entire, flat, 

 linear or oblong; lower lip 3-cleft, with linear divisions. Stamens 4, antlier- 

 bearing, unequal, exserted; anther-sacs 2, divergent. [Monardella Benth., in 

 part.] 



