286 SCROPHULARIACE.E. (I'lGWORT FAM1LT.) 



7. PENTSTEMON, Mitchell. Beakd-tongue. Pentstemon. 



Calyx 5-parted. Corolla tubular anil more or less inflated, either decidedly 

 or slightly 2-lipped ; the upper lip 2-lobed, and the lower 3-eleft. Stamens 4, 

 declined at the base, ascending above ; and a fifth sterile filament usually as 

 long as the others, either naked or bearded. Seeds numerous, wingless. — Pe- 

 rennials, branched from the base, simple above, with opposite leaves, the upper 

 sessile and mostly clasping. Flowers showy, thyrsoid-panicled. (Name from 

 Trevre,five, and orrjpav, sla men; the fifth stamen being present and conspicu- 

 ous, although sterile.) 



* Sterile filament bearded doicn one side : flowers in a loose panicle, someichat clam- 

 my, white or bluish ; peduncles slender. 



1. P. pilbeSCCIlS, Solander. More or less pubescent (1° -3° high); 

 stem-leaves lanceolate from a clasping base, serrate or sometimes entire; corolla 

 2-lipped, gradually widened upwards, flattened and one-ridged on the upper side, 

 and with 2 infolded lines on the lower which are bearded inside ; lower lip longer 

 than the upper. — Varies greatly in the foliage, sometimes nearly glabrous, 

 when it is P. lsevigatuB, Soland., &c. — Dry banks, Connecticut to Wisconsin, 

 and southward. June -Sept. 



2. P. Digitalis, Nutt. Nearly glabrous (2° -4° high); stem-leaves ob- 

 long- or ovate-lanceolate, clasping, serrulate or entire ; corolla slightly '2-lipped, 

 abruptly inflated and almost bell-shaped from a narrow base, beardless. — Moist 

 ground, Illinois and southward. —Flowers larger than in the last, showy. 



* # Sterile filament nearly smooth: flowers purple, racemose. 



3. P. graildiflorilS, Fraser. Very smooth and glaucous; stems sim- 

 ple (1° -3° high); leaves thick, ovate or rounded, the upper clasping; flowers 

 (showy, 2' long) on short pedicels, in a long and narrow raceme rather than 

 panicle ; corolla oblong-bell-shaped, almost regular. — Prairies, W. Wisconsin? 

 (Falls of St. Anthony, Lapham. Dubuque, Iowa, Dr. Hor.) 



§. MIMULUS, L. Monkey-flower. 



Calyx prismatic, 5-angled, 5-toothed, the upper tooth largest. Corolla tubu- 

 lar; the upper lip erect or reflexed-spreading, 2-lobed; the lower spreading, 

 3-lobed. Stamens 4. Stigma 2-lipped, the lips ovate. Seeds numerous.— 

 Herbs, with opposite leaves, and mostly handsome flowers on solitary axillary 

 peduncles. -(Name from ppo, an ape, on account of the gaping corolla.) 



* Erect, glabrous : leaves feather-veined : corolla violet-purple. 



1 . I?I. ringens, L. Stem square (1° - 2° high) ; leaves oblong or lanceolate, 

 pointed, clasping by a heart-shaped base, serrate; peduncles longer than the 

 flower; calyx-teeth taper-pointed. %— Wet places; common. July -Sept. 

 — Flower l'-U'long. 



2. Ifl. alatUS, Ait. Stem somewhat winged at the angles; leaves oblong- . 

 ovate, tapering into a petiole ; peduncles shorter than the calyx, which has very 

 short and abruptly pointed teeth : otherwise like the last, — Low grounds, Con- 

 necticut to Illinois, and southward. 



