766 SCROPHULARIACEAE 



Corolla glabrous wltliin, 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. Harbourlvni. 

 One species. 45. P. Harbourii. 



XII. COMFERTI. 



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



Sterile filament bearded; leaves entire or denticulate. 

 CahTv glabrous or puberulent but not glandular. 



Corolla siUpluu--yellow. 47. P. confertus. 



Corolla purple. 



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



upper acuminate. 48. P. Watsonii. 



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

 not acuminate. 

 Corolla more than 1 cm. long; upper stem-leaves broadly lanceolate, often 

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

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



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



50. P. laxus. 

 Corolla less than 1 cm. long; Umb 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; calv-x-lobes not scarious. 52. P. ovatus. 



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

 margined. 

 Leaves flrm; inflorescence rather dense; calyx-lobes narrowly scarious- 



marsined. 53. P. pnirtunnn. 



Leaves thin; inflorescence open; calyx-lobes not scarious-in;u%'in(xl. 



54. C. IcplophtjUus. 

 Upper stem-leaves lanceolate or Unear. 



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

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

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

 stem-leaves oblong-lanceolate or lanceolate. 

 Tall, 3-5 dm. high; calvx-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 lass than 2 dm. high; basal leaves itsually 

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

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



56. P. albertinus. 

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



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

 oblanceolate blades; corolla 1.5 cm. long or more. 

 Calvx-lobes ovate, broadly scarious-margined. 



Corolla sulphur-yellow. 58. P. attenuatus. 



CoroUa purplish. 



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 tliin, not darkening in drj-ing; stem-leaves tisually den- 

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

 uous panicle. 60. P. vireiis. 

 Stem and loaves decidedly jinborulent. 68. P. humilis. 

 Stem-leaves linear or liiiear-laneeolate, reduced; basal leaves numer- 

 ous, ol)lancoolate to almost liiu^ar. 61. P. aridus. 

 Calyx-lobes narrowly lanceolate, sligluly scarious-margined. 



Leaves thick and darkening in (h\iiig; inflorescence congested and 

 interrupted; corolla dark l)lue-])urj)le. 

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



62. P. psfudohumili.i. 

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

 half as long as the internodcs. 50. P. laxu.i. 



Leaves thin, liglit green, not darkening in dr>-ing; inflorescence a con- 

 tinuous ])a.iiiele; corolla wliite, light blue, or pink; leaves linear 

 or linear-lanceolate. 

 Stem glabrous or nearly so. 



Inflorescence narrow; pedicels shoit; stem-leaves Imear-lanceo- 



late. 63. P. gracilis. 



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



64. P. oliganthus. 

 Stem densely puberulent. 



