169 
the entire and eciliate ocree, and although rather old, the dark 
reddish-purple color of the racemes is apparent. 
Collected in the region of Orizaba, Mexico, by M. Bourgeau, 
1855-1856, No. 2678. 
Since writing the above paragraph I have seen another speci- 
men identical with the type from the Valley of Toluca, Mexico. 
It was found in wet places near Knoxville, Tennessee, by Mr. T. 
H. Kearney, Jr., on August 29, 1891. | 
The striking extension of the range of this well-marked variety 
is quite unexpected. / 
‘ PoLyGonuM LONGISTYLUM n. sp. 
Annual or perennial, glabrous except the upper branches and 
peduncles. Stem erect, 3-6 dm. tall, branched throughout, some- 
what enlarged at the nodes, more or less ribbed, becoming woody 
below; leaves lanceolate or narrowly-lanceolate, sometimes ovate- y 
lanceolate, 3-10 cm. long, .5—2 cm. broad, acuminate, slightly 
crisped, undulate and more or less ciliolate, petioled, acuminate at 
the base; petioles 5-12 mm. long; ocrez cylindric, entire, thin, 
brittle and soon falling away ; inflorescence consisting of terminal 
»Picate-racemes, somewhat glandular; racemes cylindric, 2-8 cm. 
Ong, I cm. broad, dense; flowers about 5 mm. broad, lilac; calyx 
5-cleft to below the middle, petaloid; segments broadly oblong, 
obtuse; stamens 6 to 8, included; style 3-3.5 mm. long, slender, 
_ onspicuously exserted ; stigmas dark-colored; achene lenticular 
2.5 mm. long, broadly ovoid, slightly gibbous on the sides, black, 
very sparingly roughened, somewhat shining or dull. (Plate 193.) 
New Mexico—(Fendler, 749); Texas—Houston, Harrisburg, 
¢tc. (Lindheimer) ; Louisiana—Jackson (Carpenter); Ilinois— 
©pposite St. Louis (Engelmann); Missouri—Dauphin county _ 
(Bush). ae ea 
While studying various collections of Polygonum, fragmentary _ 
Specimens of a form related to P. Pennsylvanicum came under my 
Notice. Owing to the scanty material, I was compelled to pass _ 
them by. However, good material is preserved in the George xe 
Engelmann Herbarium, which leads me to the above decision. ik 
@spect the plant resembles P. Pennsylvanicnm, but differs in the : 
remarkably long style, smaller and duller achene, the longer peti 
oled and more strictly lanceolate leaves. It stands between PL 
Mexicanum and P. Pennsylvanicum, both morphologically and - 
S¢ographically, OR rc 
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