313 
17. BUCHNERA L. (BLUE-HEARTS.) 
Perennial rough-hairy herbs (turning blackish in drying), with oppo- 
site leaves (or uppermost alternate), flowers opposite in a terminal spike, 
tubular obscurely nerved 5-toothed calyx, salverform corolla with a 
straight or curved tube and an almost equally 5-cleft limb, 4 stamens 
included and approximate in pairs, 1-celled anthers (the other cell want- 
ing), and a club-shaped entire style. 
1. B. elongata Swartz. Scabrous, but seldom hispid, slender, long-naked above: 
radical leaves obovate; lower oblong or lanceolate, obscurely or rarely dentate} 
upper linear: spike slender, often few-flowered: tube of purple corolla not twice 
the length of the calyx.—Extending from the pine-barrens of the Gulf States into 
Texas, 
18. SEYMERIA Pursh. 
Erect branching herbs, with leaves mostly opposite and dissected or 
pinnatifid (uppermost alternate and bract-like), yellow flowers inter- 
ruptedly racemed or spiked, bell-shaped deeply 5-cleft calyx, corolla 
with short broad tube not longer than the 5 ovate or oblong nearly equal 
and spreading lobes, 4 somewhat equal stamens, 2-celled anthers ap- 
proximate by pairs, and a many-seeded pod. 
* Style filiform and long: corolla glabrous within (except line at insertion of stamens): 
leaves small, 
+ Leaves filiformly dissected: corolla very deeply cleft. 
1. S. tenuifolia Pursh. Glabrous or branches puberulent, very slender, 6 to 12 
dm. high: leaves 12 mm. long, copiously 1 or 2-pinnately parted: pedicels filiform: 
corolla about 6 mm. and pod 4mm. long: calyx-lobes setaceous: anther-cells acutish 5 
filaments minutely woolly at base.—Extending from the pine-barrens of the Gulf 
States into Texas. 
+ + Leaves or their divisions linear or broader: corolla lobes about as long as tube and 
throat: pedicels short. 
++ Pods ovate and gradually acuminate, 8 to 10 mm. long, glabrous or nearly 80: anthers 
sagittate, the cells very acute. 
2. S. scabra Gray. Hispidulous-scabrous, not glandular, slender, 6 dm. high: 
leaves sparingly pinnately parted into few narrow linear divisions, or the upper few- 
lobed or entire: calyx-lobes subulate-linear: corolla glabrous.—Mountains of south- 
western Texas, beyond the Pecos. 
3. S. virgata Beuth. Viscid-puberulent, very slender: leaves pinnately cut into 
narrowly linear mostly incised lobes: calyx-lobes linear: pod nearly glabrous.— 
A Mexican species, discovered in the Chenate Mountains, southwestern Texas 
(Nealley). 
++ ++ Pod broadly ovate and merely acute, 4 mm. long, glandular-hairy: anthers very 
obtuse. 
4, S. pectinata Pursh. Minutely viscid-pubescent or glabrous, about 3 dm. high, 
slender: leaves pinnately parted into rather few short- or oblong-linear divisions, 
or the upper incisely few-toothed or entire: calyx-lobes linear: corolla hairy outside, 
especially in bud.—Dry sandy soil of Gulf States, and extending into Texas. 
5. S. bipinnatisecta Seem. Very glandular-pubescent and viscid, 3 to 6 dm. 
high, stouter: leaves rather copiously 1 to 3-pinnately parted; the divisions from 
linear to oblong, small, often incisely toothed; even the bracts and sometimes the 
oblong-linear calyx-lobes lobed or incised: corolla somewhat glandular-pubescent 
outside.—Southern and western Texas. 
