182 
DIADELFH1A OCTANDRJA. 
The remarkable racemes of this plant, which run just under the sur- 
face of the earth, have neither corolla nor calycine wings, yet appear to 
ripen their seeds 5 the florets near the end of these racemes are always 
abortive. 
If this plant is the P. Rubella of Willd. with which it appears very ac- 
curately to agree, it is very widely extended over the United States, as Mr. 
Nuttall found that species very abundant in the pine forests around Uake 
Michigan. 
Grows in light oak lands. 
Flowers from May to July. 
4. Senega. 
P. caule erecto,sim- 
plici ; foliis lanceola- 
tis,acuminatisque; spi- 
ca terminali, filiformi. 
Sp. pi. 3. p. 894. Walt. p. 178. 
Stem erect, simple; 
leaves lanceolate, a- 
cute and acuminate ; 
spikes terminal, fili- 
form. 
Mich. 2 . p. 53. Pursh 2 . p. 464. 
Root fibrous, perennial. Stem 8 — 14 inches high, slightly pubescent. 
heaves nearly sessile, lanceolate and oval, sometimes very wide, when ful- 
ly grown, generally acuminate. Flowers somewhat clustered in a termi- 
nal spike, sessile, white. Seed hispid. 
Grows in the mountainous districts of Carolina. 
Flowers June — August. 
5. Verticillata. 
P. caule erecto, ra- 
moso ; foliis verticil- 
latis, linearibus ; spi- 
cis setaceis, peduncu- 
latis ; floribus dis- 
tincte alternis, approx- 
imate. 
Stem erect, branch- 
ing ; leaves verticil- 
late, linear; spikes se- 
taceous, pedunculate ; 
flowers approximate, 
distinctly alternate. 
Sp. pi. 3. p. 897* Mich. 2. p. 53. Pursh 2. p. 466. 
Stem 8 — 12 inches high, slightly angled. Leaves opposite, verticillate, 
sometimes solitary, linear, acute, glabrous, finely serrulate. Bracteas 
purplish, shorter than the calyx, deciduous. Calycine wings white, ting- 
ed with purple. Corolla nearly white, fimbriate, with two segments, pro- 
