OF ARTS AND SCIENCES. 295 
Avicularia. All the species are low slender erect and branching 
annuals. — P. Catirornicum, Meisn., is somewhat taller, with longer 
narrower and looser spikes, short sheathing deeply lacerate stipules, 
shorter bracts scarcely equalling the slightly larger flowers, and a 
longer akene with but slightly divergent styles. 
Potyeonum (DurRAviIA) GREENEI. Resembling P. Californicum, 
with denser spikes, the bracts and wholly fimbriate stipules 2 lines 
long: styles very short, somewhat spreading. — Plains of Shasta, 
Rey. E. L. Greene, 1876; near Chico, Mrs. J. Bidwell, July, 1878. 
Portyconum (PersicariaA) MUBLENBERGII. Perennial, in muddy 
or dry places, often 2 or 3 feet high, scabrous with short appressed or 
glandular hairs, especially upon the leaves and upper stem: leaves 
thin, rather broadly lanceolate, long-acuminate, usually rounded or 
cordate at base, 4 to 7 inches long, on short stout petioles (4 to 1 inch 
long) from near the base of the naked sheath: flowers and fruit nearly 
as in P. amphibium, but spikes more elongated (1 to 3 inches long), 
often in pairs. — New England to Texas and westward to Washington 
Territory and N. California. P. amphibium, var. (?) Muhlenbergii, 
Meisn. in DC. Prodr. 14, 116, and including most of the var. terrestre 
of American botanists. Our subterrestrial form of P. amphibium 
seems rarely if ever to correspond to the var. terrestre of Europe. 
Erroconum (Ever1ogconum § Fo.iosa) PuBERULUM. A low 
annual, dichotomously branching from near the base, appressed silky- 
puberulent througliout: leaves all radical, obovate, 3 or 4 lines broad : 
bracts foliaceous, mostly ternate, narrowly oblong, 2 lines long or less : 
involucres sessile in the forks, very small, 4-parted: flowers few, 
glabrous, rose-colored, about 2 of a line long: sepals oblong. — On 
Red Creek, S. Utah; Dr. E. Palmer (n. 429, 1877). 
Erroconum (Ganysma § PepuncuLaTa) Hooker. Glabrous, 
a foot high or more ; stem slender, not branching near the base as do- 
the rest of the group: leaves densely floccose-tomentose both sides, 
orbicular: involucres campanulate, sessile or nearly so, reflexed and 
secund upon the branches: flowers pale yellow, the outer sepals 
subreniform-cordate, a line long ; the inner oblong-ovate, half as long: 
akene abruptly beaked, } line long. — Wahsatch Mountains, American 
Fork Cafion (n. 1033 Watson, at least in part) ; W. Nevada, Hooker 
& Gray, 1877. Referred in King’s Rep. 5. 306 to #. deflerum, which 
branches from the base, has more turbinate involucres, smaller flowers 
with narrower rose-colored sepals, and a more attenuate akene. 
ERIOGONUM INSIGNE. Of the same group: becoming very stout 
and 2 or 3 feet high, glabrous excepting the reniform-cordate densely 
