Acid soils of the Gulf Coastal Plain, edge of marshes, in seepage areas, bogs, 

 about ponds and lakes and grassy flatwoods, throughout e. Tex., Mar.-June; Ga. 

 to Okla. and Tex. 



2. Penstemon tenuis Small. 



Plants 4-9 dm. tall, the stem very lightly puberulent; leaves sharply but 

 shallowly toothed, those of the midstem 7-10 cm. long, 1.5-3 cm. wide, oblong- 

 lanceolate; inflorescence glabrous; sepals 3-5 mm. long; corolla pink, 15-17 mm. 

 long, abruptly inflated, the floor rounded, with violet lines; staminode with yellow 

 hairs on apical half. 



Uncommon in low poorly drained loamy soils, in water of shallow depres- 

 sions, and in low prairies and marshes, in the Gulf Prairies and Marshes in Tex. 

 and (?) Okla. (McCurtain Co.), Apr.-May; also La. and Ark. 



3. Penstemon Digitalis Nutt. 



Plants mostly 5-9 dm. tall, the stem and leaves glabrous; leaves subentire or 

 obviously toothed, those of the midstem mostly 9-12 cm. long, 15-25 mm. wide, 

 lanceolate; inflorescence glabrous or a little glandular; sepals 5-6 mm. long, 

 glabrous or a little glandular; corolla white, 16-30 mm. long, moderately ventri- 

 cose, the lobes extending, the floor rounded and commonly unlined; staminode 

 lightly bearded with yellow hairs; anther sacs cymbiform, spiny or hairy on the 

 backs; seeds less than 1 mm. long. 



An Ozarkian species which has become widely spread as a weed in poorly 

 drained soils, in water of streams, in wet meadows, alluvial woodlands, in wet soil 

 on edge of ponds and lakes, occasional in Okla. (McCurtain and Atoka cos.) and 

 n.e. and e. Tex., Apr.-July; Me. and Que. to S.D., s. to Ala., La., Tex. and Okla. 



4. Penstemon Whippleanus Gray. 



Plants tufted from surficial branched caudex, 2-6 dm. tall, essentially glabrous 

 below, becoming strongly glandular-hairy in the inflorescence; leaves (at least a 

 few of them) toothed, the basal with elliptic to ovate blade to 6 cm. long and 3.5 

 cm. wide, longer or shorter than the petioles; cauline leaves mostly sessile, oblong 

 to lanceolate, to about 6 cm. long and 1.5 cm. wide; inflorescence of 2 to 7 

 verticillasters that are not very dense; calyx elongate, 7-1 1 mm. long, the lanceo- 

 late segments essentially entirely herbaceous; corolla glandular-pubescent exter- 

 nally, blue or violet to dull-purple or lavender to cream-color, sometimes vari- 

 colored, 18-28 mm. long, strongly inflated distally, mostly 7-11 mm. wide at the 

 mouth, strongly bilabiate, the lower lip much the longer; palate bearded; pollen 

 sacs broadly ovate, glabrous, 1-1.4 mm. long, wholly dehiscent, becoming op- 

 posite and eventually explanate; staminode noticeably exserted from the orifice 

 of the corolla, usually bearded toward the scarcely expanded tip; ovary and 

 capsule usually glandular-puberulent near the tip; capsule 6-9 mm. long. P. steno- 

 sepalus (Gray) Howell. 



On seepage banks about small lakes, wet meadows and on conifer forest slopes, 

 in N. M. (Bernalillo, Sandoval and Taos cos.) and Ariz. (Coconino and Mohave 

 COS.), July-Sept.; Mont, to N.M. and Ariz. 



5. Penstemon Rydbergii A. Nels. 



Plant more or less tufted from a loose or compact surficial woody rhizome- 

 caudex, 2-7 (-12) dm. tall, rather slender-stemmed, glabrous throughout or 

 sometimes puberulent in the inflorescence and along the stem; leaves entire, the 

 basal ones petiolate, oblanceolate to narrowly elliptic, often forming distinct 

 rosettes, to 15 cm. long and 2 cm. wide; cauline leaves few and mostly well- 

 developed, usually sessile or nearly so, rarely to 10 cm. long and 2 cm. wide; 



1488 



