307 
5. MAURANDIA Ortega. 
Herbs climbing mostly by the slender tortile petioles, with cordate- 
triangular or hastate leaves (only the lower opposite), showy purple or 
rose-colored (rarely white flowers), nearly funnelform ringent corolla 
barely gibbous at base and with two longitudinal and commonly bearded 
intruded lines or plaits instead of palate; otherwise as the two prece- 
ding genera. 
1. M. Wislizeni Engelm. Glabrous: leaves hastate or some of them sagittate; 
lowest obtuse, the others acuminate and with pointed basal lobes: corolla pale blue, 
with lips about half the length of the ample tube: sepals becoming much enlarged 
and very veiny-reticulated and strongly saccate-keeled at base, inclosing the pod, 
and about the length of the sworc-shaped indurated style.—Southern and western 
Texas. 
6. PENTSTEMON Mitchell. (BEARD-TONGUE.) 
Perennials, with opposite leaves (upper sessile and mostly clasping), 
mostly showy thyrsoid or racemose-panicled flowers, 5-parted calyx, 
tubular and more or less inflated or bell-shaped more or less 2-lipped 
corolla, 4 stamens declined at base and ascending above, and a fifth 
sterile-filament usually as long as the others and either naked or beard- 
ed.—Ours all belong to § EUPENSTEMON, in which the anther-cells are 
soon divaricate or divergent, united and often confluent at apex, and 
dehiscent for their whole length or nearly. 
* Anthers glabrous, reniform, not explanate in age, the line of dehiscence stopping a little 
short of the base of the cells: stems suffruticose and leaves thick-coriaceous. 
1. P. baccharifolius Hook. Glabrous, or the rigid branches puberulent, 6 dm. 
high, leafy below: leaves oblong, nearly sessile, rigidly and acutely dentate, 2.5 em. 
long; uppermost abruptly reduced to small ovate bracts of the loose and racemose 
glandular inflorescence: corolla deep carmine-red, 2.5 cm. long: sterile filament 
naked.—Southwestern Texas, on the San Pedro and the Pecos. 
** Anthers glabrous ; the cells dehiscent from base towards but not to apex, hence not ex- 
planate afier dehiscence: corolla red: glabrous herbs. 
2. P. barbatus Nutt. Usually tall, 6 to 18 dm. high: leaves lanceolate or the upper 
linear-lanceolate; the lowest and radical oblong or ovate: corolla strongly bilabiate, 
2.5 em. long, from light pink-red to carmine; base of the lower lip or throat usually 
bearded with long and loose or sparse yellowish hairs: sterile filament glabrous,— 
In the mountains west of the Pecos, where also occurs var. TORREYI Gray, a talland 
usually deep scarlet-red-flowered form, with few orno hairs in the throat. 
3. P. Hatoni Gray. Lower, 3 to 6 dm. high: leaves lanceolate to ovate; the upper 
partly clasping: thyrsus virgate and strict, the peduncles very short: corolla ob- 
scurely bilabiate, 2.5 cm. long, bright carmine-red, tubular, hardly enlarged at the 
naked throat: sterile filament sometimes minutely bearded at apex.—Reported from 
the Chisos Mountains, southwestern Texas (Havard). 
“** Anthers from glabrous to hirsute; the diverging or divaricate and distinct cells de- 
hiscent from base nearly or quite to (but not conjfluently through) apex, not pel- 
tately explanate after dehiscence : flowers showy, blue or violet, ampliate above. 
4, P. glaber Pursh. Stems 3 to 6 dm. high: leaves mostly oblong-lanceolate or the 
upper ovate-lanceolate: thyrsus elongated, the peduncles and pedicels very short: 
corolla 2.5 to 3.5 cm. long, bright blue to violet purple: anthers and apex of sterile 
18430—No. 2 11 
