170 
Dr. Engelmann referred the form to the latter species, provis- 
ionally, remarking that the achene was too small, and further it is 
not orbicular or depressed-orbicular as in P. Pennsylvanicum, but 
broadly-ovoid and slightly gibbous. 
Poryconum Mexicanum Small, Bull. Torr. Club, 19: 356 (1892). 
A species of the Mexican Flora new to the United States. 
Recently discovered by Rev. Mr. Langlois, who gives me the fol- 
lowing information: Growing in fields, ditches, etc., about St. Mar- 
tinsville, Louisiana. It is common, often attains a height of 12 to 
15. decimeters, and is very attractive on account of the abundance 
of its fine flowers. 
POLYGONUM DENSIFLORUM Meisn. in Mart. Fl. Bras. 5: 13 (1855)- 
Here, is a case in which a species of the Gulf region follows 
the Mississippi River Valley as far as Southern Missouri, thus. 
coming into the region of the « Northern Flora.” ; 
The plants vary a little from some of the southern forms 1 
having narrower leaves, and the achene is broadly oblong instead 
of orbicular. It has been found at two localities in Missoutt, 
Dunklin county, September 18, 1893 (Bush, 116), and swamps, 
Southeastern Missouri, November 19, 1893 (Trelease). : 
On Lindheimer’s specimens from Texas varying from the type, , 
towards a more slender build and corresponding to these plant. ¢ 
from Southern Missouri, Engelmann once thought of founding 4 
species P. Texanum, but left, as far as I have been able to learn, 
only a manuscript name. 
ER Mas yore Cater t Sas ag Tied a oat 
¥ PotyGonum NEWBERRYI n. sp. 
Perennial, dull green, fleshy and stout, more or less puberu- 
lent throughout or sometimes glabrous. Stems apparently 2-4 
dm. tall, stout, slightly channeled, more or less flexuous, stro y 
puberulent (in the type), nearly simple or short-branched abe = 
_ internodes about 3 cm. long near the base, 1 cm. long nearh 
summit of the stem, primary internodes of the branches about ‘ee 
the length of the opposite stem internodes; leaves ovate ree a 
broadly oblong-ovate, 1-4.5 cm. long, .5—3 cm. broad, subsess! <2 
or short petioled, obtuse or subapiculate, acute or obtuse at ‘ 
base, sometimes truncate, fleshy, becoming more or less rug. 
wrinkled with age and in drying, attached near the base of ta 
ocree ; ocree funnel-form, light brown, pubescent or nearly g a 
brous, thin and brittle; inflorescence of a few axillary racemes » 
racemes narrow, short (1 cm. long), few-flowered, somen®™ 
