FIGWORT FAMILY 219 



IV. PENTSTEMON Mitchell 



Perennials, the stems branching from the base, unbranched 

 above. Leaves opposite. Flowers usually showy, in a ter- 

 minal panicle. Calyx of 5 nearly distinct sepals. Corolla 

 tubular, the tube wide above and narrowed below; 2-lipped. 

 Stamens 4 (2 long and 2 short), with a fifth antherless fila- 

 ment as long as the others, its upper half bearded. Capsule 

 ovoid, acute. 



1. P. hirsutus Willd. Stem somewhat sticky-downy, 1-2 ft. high. 

 Leaves varying from oblong to lanceolate, 2-4 in. long, usually with 

 small teeth. Flower cluster narrow. Corolla dingy violet, purplish, 

 or whitish ; the tube not much widened above, its throat nearly closed 

 by a hairy palate. Sterile filament much bearded. Dry hillsides or 

 stony ground. 



2. P. gracilis Nutt. SLENDER BKAKDTONGUE. Stem 6-18 in. 

 high, smooth below but the flower cluster covered with glandular, 

 sticky hairs. Basal leaves spatulate or oblong ; stem leaves most of 

 them linear -lanceolate. Corolla purple or whitish, |-1 in. long, the 

 tube enlarged above and its throat entirely open. Sterile filament 

 bearded above along half its length. On moist prairies W. 



3. P. laevigatus Ait. Stem usually smooth except the flower cluster, 

 2-4 ft. high. Leaves shining, those of the stem ovate-lanceolate or 

 broadly lanceolate, 2-5 in. long, with a somewhat heart-shaped, clasp- 

 ing base. Flower cluster broader than in No. 1. Corolla white or 

 oftener purplish, suddenly widened above, the throat not closed. 

 Sterile filament slightly bearded toward the top. In rich soil. 



4. P. Digitalis Nutt. Much resembling N"o. 3, but taller, sometimes 

 5 ft. high. Corolla white, the tube abruptly widened. In fields and 

 thickets ; sometimes cultivated. 



5. P. barbatus Roth. Stems slender and rod-like, 3-4 ft. high. 

 Leaves lanceolate, entire. Flower cluster long and loosely flowered. 

 Flowers showy, drooping. Corolla tube slender, scarlet, somewhat 

 bearded in the throat. Sterile filament beardless. Cultivated from 

 Mexico. 



V. GRATIOLA L. 



Low herbs, growing in wet or damp ground. Leaves oppo- 

 site, sessile. Flowers axillary and solitary, peduncled. Calyx 

 5-parted, usually with 2 bractlets at the base. Corolla some- 

 what 2-lipped. Perfect stamens 2. Stigma enlarged or 2-lipped. 

 Pod 4-valved, many-seeded. 



