times with revolute margins, glabrous or sparsely puberulent, entire; glomerules 

 solitary and terminal, disposed in rather crowded or open corymbs that are simple 

 or made up of several to many secondary corymbs; appressed lance-attenuate 

 bracts and glabrescent lance-subulate calyx teeth 1-2 mm. long, with firm sharp 

 tips; corolla white to pale-lavender, usually purple-spotted; corolla tube 3-4.5 mm. 

 long, pubescent within the throat, the upper lip 2-2.5 mm. tall.. P. flexuosum of 

 auth. 



In grassy moist open woods, bogs, savannahs, old fields, meadows and marshes 

 in the e. fourth of Tex. and s.e. Okla. (LeFlore Co.), May-Oct.; from Ga. to 

 Tex., n. to N. E., N.Y., Ont., O., Mich., Wise, and Minn. 



2. Pycnanthemum virginianum (L.) Dur. & Jacks. 



Stems to 1 m. tall, freely branched above the middle, finely pubescent or 

 hirsutulous on the angles, glabrous or nearly so on the sides; leaves numerous or 

 crowded, linear-lanceolate, glabrous above, often puberulent on the midvein be- 

 neath, minutely scabrous on the margin, the principal ones usually 3-6 cm. long 

 and 3-10 mm. wide, the bracteal leaves similar in shape but much smaller than 

 the cauline leaves; lateral veins 3 or 4 on each side of the midvein, the uppermost 

 arising near the middle of the leaf; inner bracts thin, acute to short-acuminate, 

 densely canescent to tomentulose; calyx densely canescent toward the apex, the 

 deltoid lobes about 0.7 mm. long. 



Wet meadows, swamps, wet ledges, moist ground along streams and spring 

 branches in Okla. (Waterfall), July-Sept.; Me. to N.D., s. to Ga. and Okla. 



3. Pycnanthemum albescens T. & G. 



Plant to 15 dm. high, branching in the upper parts, the branches ascendent 

 or divaricate-ascendent; median internodes about equal to the subtending leaves, 

 the upper internodes pubescent with short curled hairs and bearing a few longer 

 spreading hairs or pubescent with short curled hairs only; leaves with petioles 

 4-12 mm. long, ovate to ovate-lanceolate or elliptic, all but the lower strongly 

 whitened, paler and minutely pubescent beneath, serrate, 2.5-7 cm. long. 1-2.5 

 cm. broad; glomerules terminal and solitary or occasionally 2, loose, disposed in 

 irregular corymbs, the branches apparent, canescent; bracts of the involucre foliar 

 and strongly whitened, canescent, rarely with a few longer hairs; calyx canescent 

 throughout with minute appressed hairs, without bristles at the tip, 3.5-5 mm. 

 long, the lower pair of ovate or oblong teeth obtuse and 1-1.3 mm. long, the 

 upper deltoid teeth connate to the middle or more and obtuse; corolla white or 

 lavender, usually spotted; corolla tube gradually enlarged upward, 3-4.5 mm. 

 long, the upper lip 2-4 mm. tall. 



In low open woods, often along streams, in wettish savannahs and in thicket 

 areas in Okla. (Waterfall) and e. Tex., July-Nov.; from Fla. to Tex., n. to Mo. 

 and e. Okla. 



16. Micromeria Benth. 



About 100 species widely distributed. 



1. Micromeria Brownei (Sw.) Benth. var. pilosiuscula Gray. Fig. 660. 



Weak plants with slender sprawling or diffusely spreading sparsely pilose- 

 pubescent stems, to about 4 dm. high or long; leaves petioled, suborbicular to 

 broadly ovate, obscurely crenate, the larger ones to 25 mm. long and 2 cm. wide, 

 thin, glabrous to sparingly pubescent; pedicels filiform, to 15 mm. long; flowers 

 1 to 3 in axillary one-flowered cymes; calyx sparingly pilose to glabrate, 4-5 mm. 

 long, somewhat villous in the throat; calyx lobes 5, subequal, ovate-deltoid, 

 1-1.5 mm. long, those of the upper lip abruptly acute or even acuminate; corolla 



1448 



