766 SCROPHULARIACEAE 



Corolla glabrous within, less than 2 cm. long; calyx-lobes lanceolate, 4—5 mm. 

 long. 43. P. pumilus. 



Corolla-tube funnelform, scarcely gibbous; sterile stamen sparingly yellow-villous above; 

 corolla white. 44. P. albidus. 



XI. HARBOURL\JfI. 



One species. 45. P. Harbourii. 



XII. COXFERTI. 



Sterile filament usually naked; leaves sharply dentate. 46. P. deustus. 



Sterile filament bearded; leaves entire or denticulate. 

 Calyx glabrous or puberulent but not glandular. 



Corolla sulphur-yellow. 47. P. confertus. 



CoroUa piu"ple. 



Calyx 2-3 mm. long; lobes rounded-ovate, acute, denticulate; leaves thin, the 



upper acuminate. 48. P. Watsonii. 



Calyx 5-6 mm. long; lobes ovate, abruptly acuminate or obttise; leaves firm, 

 not acuminate. 

 Corolla more than I cm. long; upper stem-leaves broadly lanceolate, often 

 roimded at the base; plants 3 dm. high or more. 

 Calyx-lobes ovate, acuminate. 49. P. Rydbergii. 



Calyx-lobes broadly obovate, obtuse or abruptly short-acuminate. 



50. P. laxus. 

 Corolla less than 1 cm. long; limb small; upper stem-leaves linear-lanceo- 

 late; plant seldom more than 3 dm. high. 51. P. procerus. 

 Calyx and inflorescence more or less glandular. 

 Leaves more or less denticulate. 



Upper stem-leaves broad, ovate-cordate, acuminate, clasping. 



Stem pubescent; calyx-lobes not scarious. 52. P. ovatus. 



Stem glabrous or sparingly puberulent up to the inflorescence; calyx-lobes 

 margined. 

 Leaves firm; Inflorescence rather dense; calyx-lobes narrowly scarious- 



margined. 53. P. pinetorum. 



Leaves thin; inflorescence open; calyx-lobes not scarioiLs-margined. 



54. C. leptophyllus. 

 Upper stem-leaves lanceolate or Unear. 



Calyx-lobes elongate-lanceolate, not scarious; flowers ascending; stem- 

 leaves linear-lanceolate or hnear. 62. P. gracilis. 

 Calyx-lobes ovate-lanceolate, scarious-margined below and usuaUy toothed ; 

 stem-leaves oblong-lanceolate or lanceolate. 

 Tall, 3-5 dm. high; calyx-lobes acute. 55. P. Wilcoxii. 

 Low, less than 3 dm. high; calyx-lobes abruptly acuminate. 



60. P. virens. 

 Leaves entire or essentially so. 



Plant depressed, decumbent; stems less than 2 dm. high; basal leaves usually 

 less than 3 cm. long, with rhombic-ovate or rounded-spatulate blades. 

 CoroUa about 1.5 cm. long; stem-leaves more or less denticulate. 



56. P. albertinus. 

 Corolla 1 cm. long or less; stem-leaves entire. 57. P. brevifolius. 



Plant not depressed, 2-7 dm. high; basal leaves more than 3 cm. long, with 

 oblanceolate blades; corolla 1.5 cm. long or more. 

 Calyx-lobes ovate, broadly scarious-margined. 



Corolla siilphur-yellow. 58. P. atienuatus. 



Corolla piu'plish. 



Stem-leaves ample, lanceolate or oblong. 

 Stem and leaves glabrous or nearly so. 



Leaves thick, darkening In drj-ing; stem-leaves always entire; 

 Inflorescence Interrupted, congested. 



59. P. pseudoprocerus. 

 Leaves thm, not darkening m drying; stem-leaves usuaUy den- 

 ticulate; Inflorescence not congested, a more or less contin- 

 uous panicle. 60. P. virens. 

 Stem and leaves decidedly puberulent. 68. P. humilis. 

 Stem-leaves linear or Unear-lanceolate, reduced; basal leaves numer- 

 ous, oblanceolate to almost linear. 61. P. aridus. 

 Calyx-lob""? narrowly lanceolate, sUghtly scarious-margined. 



Leaves thick and darkening in drjong; inflorescence congested and 

 Interrupted; coroUa dark blue-purple. 

 Plant 2-3 dm. high; upper stem-leaves linear-lanceolate or oblongj^ 



62. P. pseudohumilis. 

 Plant 5-7 dm. high; upper stem-leaves ovate-lanceolate, less than 

 half as long as the tnternodes. 50. P. laxus. 



Leaves thin, light green, not darkening in drjing; Inflorescence a con- 

 tinuous panicle; corolla white, light blue, or pink; leaves linear 

 or Unear-lanceolate. 

 Stem glabrous or nearly so. ■ 



Inflorescence narrow; pedicels short; stem-leaves Unear-lanceo- 

 late. 63. P. gracilis. 

 Inflorescence open; pedicels long; stem-leaves narrowly Unear. 



64. P. oliganthus. 

 Stem densely puberulent. 



