5. Distribution in eastern half of Texas, in dry or wet soil; rhizome short and 



thick (6) 



6(5). Corolla very pale lavender-pink or whitish; mostly in sandy or gravelly 

 soils 6. P. Digitalis. 



6. Corolla reddish-purple or deep lavender-pink, the lobes purplish; mostly in 



wet clayey soils 7. P. piilchella. 



1. Physostegia micrantha Lundell. Fig. 664. 



Erect rhizomatous herb to 9 dm. high, slender, the internodes progressively 

 longer from base to apex, the upper nodes puberulent, otherwise glabrous below 

 the inflorescence; leaves small, glabrous, chartaceous, linear-lanceolate or oblong- 

 lanceolate, acute to acuminate, to 12 cm. long and 11 mm. wide, the basal leaves 

 petiolate, the medial leaves largest, sessile, clasping at base, the apical leaves 

 bractlike below the inflorescence; leaf margin repand to sinuate, rather remotely 

 and inconspicuously denticulate; inflorescence to 2 dm. long, slender, usually 

 simple, sometimes with 2 lateral branches at the basal node, densely puberulent; 

 bracts shorter than the calyx, puberulent; flowers subsessile, the puberulent 

 pedicels about 1 mm. long; calyx pellucid-punctate, puberulent, 3-4 mm. long, the 

 acute teeth slightly shorter than tube; corolla white, tinged lavender or pink, 

 puberulent, 5-7 mm. long, the campanulate tube shorter than the calyx; filament 

 glabrous. 



Wet bottomland along creek in mud and water and about ponds in river flood- 

 plains, in Tex. (Grimes and Titus cos.) and Okla. (McCurtain Co.), May-June. 



2. Physostegia intermedia (Nutt.) Englem. & Gray. 



Slender, rhizomatous, 3-15 dm. high; leaves dark-green, linear-lanceolate to 

 linear, thickish, the larger 3-12 mm. broad, the margin repand-sinuate and 

 entire or rarely obscurely dentate, all but the lowest attenuate, the uppermost 

 greatly reduced; spike very slender, much-interrupted, the lateral ones (if devel- 

 oped) strictly erect, the rachis 5-35 cm. long; corolla lavender, purple-spotted in 

 throat, 1-1.5 cm. long, rarely more. 



Usually found in wet periodically flooded areas or even growing as an aquatic 

 along ditches, in swamps, marshes and bottomlands in Okla. {Waterfall) and in e. 

 and most of s. half of Tex., Apr.-June; from Ky. to Kan., s. to Ala., La. and Tex. 



3. Physostegia angustifolia Fern. Fig. 665. 



Stem stitfly erect, with rhizomes to 3 dm. long, to about 2 m. high; leaves 

 rigid, sessile or the lower ones with slender petioles to 2 cm. long, grayish or 

 pale, linear to narrowly lanceolate or oblong-lanceolate, the lower leaves obtuse 

 to subacute; median leaves attenuate and appressed-acerose-serrate, to 13 cm. long 

 and 12 mm. wide, rarely larger, the uppermost leaves passing rather abruptly into 

 the small leafy bracts of the inflorescence; spikes slender, virgate, solitary or 

 with few erect laterals, to 35 cm. long, remotely flowered: branches of inflores- 

 cence, bracts and calyces finely and densely pubescent with nonglandular hairs; 

 calyx 6-10 mm. long; corolla pale- to deep-purple or whitish, purple-spotted, 2.5-3 

 cm. long; cocci dark-brown. 3 mm. long or more. P. edwardsiana Shinners. 



In marshy areas, on gravel bars, along streams, roadsides and fields and 

 meadows in e. and cen. Tex., Apr.-July; from 111. to Tenn., s. to Miss., La. and 

 Tex. 



4. Physostegia praemorsa Shinners. 



Perennial with rhizomes; stem glabrous, to about 12.5 dm. high; lower leaves 

 shortly petiolate, narrowly oblong to lanceolate or oblong-lanceolate, acute, 3-7 

 cm. long, 5-13 mm. wide, the margins sharply serrate except near base, gradually 

 reduced above to sessile linear-lanceolate bracteal leaves; inflorescence simple 



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