1062 RHINANTHACEAE 
3-flowered, glandular-pubescent : calyx-lobes lanceolate or oblong-lanceolate, 6-10 mm. 
long, acute: corolla rose-purple, about 2.5 cm. long, the tube gradually dilated: stami- 
nodium glabrous. 
On hillsides, central Texas. Spring. 
17. Pentstemon Hélleri Small. Puberulent, or glabrate below the inflorescence, 
thence minutely glandular-pubescent. Stems 3-6 dm. tall: leaves lustrous ; blades various, 
those of the basal and lower stem-leaves oblong-spatulate or nearly linear, 6-10 cm. long, 
acute, narrowed into winged petioles, those of the upper leaves oblong to broadly ovate, 
acute, sessile, all undulate or slightly toothed: calyx-lobes densely glandular-pubescent, 
ovate to elliptic-ovate, 8-10 mm. long, acutish: corolla white or rose, sometimes 
tinged with blue, minutely glandular-pubescent, 3-3.5 cm. long, rather gradually en- 
larged : capsules conic-ovoid, at least 1 cm. long, not reticulated, much surpassing the 
calyx. 
On prairies, central Texas. Spring. 
18. Pentstemon Cobaéa Nutt. Pubescent, at least above. Stems 3-6 dm. tall; 
leaves various; those of the basal and lower stem-leaves with spatulate or oblong blades 
narrowed into margined petioles ; upper stem-leaves few ; blades oblong to ovate, 4-12 cm. 
long, partly clasping, nearly entire or sharply serrate : calyx-lobes ovate-lanceolate, 1-1.5 
em. long, rather acute: corolla 3.5-6 cm. long, dull reddish purple or paler, glabrous 
within : staminodium sparingly bearded : capsules ovoid, about 1.5 cm. long, reticulated, 
shorter than the calyx or barely surpassing it. 
On prairies, Kansas to Texas. Spring. 
19. Pentstemon grandifldrus Nutt. Glaucous. Stems 3-9 dm. tall, simple or 
nearly so. Basal and lower stem-leaves with spatulate or oblong blades 5-10 em. long, 
petioled : upper stem-leaves orbicular or ovate, 3-9 cm. long: panicle narrow: calyx-lobes 
glabrous, lanceolate to oblong-lanceolate, 7-9 mm. long: corolla lilac or lavender-blue, 
4.5-5 cm. long ; tube abruptly dilated below the middle: staminodium sparingly pubes- 
cent near the apex : capsules ovoid, 2-2.5 cm. long, reticulated at maturity. 
On plains, Minnesota to South Dakota, south to Illinois, Indian Territory and Kansas. Summer. 
20. Pentstemon Murrayànus Hook. Glaucous. Stems 3-10 dm. tall: basal and 
lower stem-leaves with spatulate or oblong blades 7-10 cm. long, narrowed into petiole-like 
bases ; upper stem-leaves leathery ; blades connate-perfoliate, ovate to broadly oblong, 4-8 
cm. long, often abruptly pointed: panicle narrow: calyx-lobes ovate, 4-5 mm. long, or 
slightly larger at maturity, acute: corolla deep scarlet, 2.5-3 em. long; tube gradually 
dilated : staminodium glabrous : capsules ovoid, 1.5 cm. long, about 3 longer than the calyx. 
On prairies, Texas. Summer. 
ll. PAULOWNIA Sieb. & Zucc. 
Trees simulating Catalpa, with flaky bark. Leaves opposite: blades ample, broadest 
below the middle, entire or 3-lobed, long-petioled. Flowers in large terminal panicles. 
Calyx-lobes 5. Corolla violet or pink-purple, 2-lipped : tube trumpet-shaped, the lobes of 
both lips spreading. Stamens 4, included : anther-sacs divergent. Styles mostly united, 
the tips stigmatic on the inner side. Capsule ovoid, leathery, loculicidally dehiscent. 
Seeds numerous, winged. 
1. Paulownia tomentdsa (Thunb.) Baill. A tree with large spreading branches. 
Leaf-blades ovate or suborbicular, 1.5-4 dm. long, acute or acuminate, densely tomentose 
beneath, cordate, prominently nerved beneath : calyx 10-14 mm. long, densely tienes 
lobes ovate to oblong: corolla violet, pubescent without, 4-5 cm. long, the limb 3.5-4. 
cm. broad, the lobes rounded : capsules ovoid, 3-4 cm. long, acute. 
In waste places and thickets, New York to Florida and Texas. Naturalize 
Spring and summer. 
d from eastern Asia. 
12. MÍMULUS L. 
Leaves opposite: blades flat, toothed. 
nicles. Calyx-tube 
tube with 2 ridges 
Annual or perennial caulescent herbs. 
Flowers solitary in the axils, sometimes disposed in racemes or pa 
angled, longer than the lobes. Corolla of various colors, 2-lipped : 4: 
within on the lower side: upper lip spreading or reflexed : lower lip erect. pura 
filaments partly adnate to the corolla-tube: anther-sacs divergent. Styles Hae 
2-lobed stigma. Capsule loculicidally dehiscent, enclosed in the calyx. MoNKEY-FLOWER- 
