ON SECTION AVICULARIA OF THE GENUS POLYGONUM. 665 
IL PF. RUM, Meisn.— Smooth, erect or ascending, 2-3° high, the branc ja 
short- airy k branchlets Hoi terete; leaves linear-lanceolate, 1-2' long, acute, o 
sometimes oblong, but 3’ beet and obtuse; Tt hardly exceeding the flowers; pedi 
cels slender, exserted fr e short shea ths; sepals colored, P long; Seamnene © 
in the last.— Texas to Kansas. Meisn r was m mistaken in sera Kees paesi B peren- 
nial sy tt and perhaps also in ane to it the ree th Am rale. 
OARCTATUM, Dougl. — Resembling P. tenue, but irous-puberulent, the 
stems wen brown; leaves linear, acute, ERL ed; eri u sally ı rather dense; calyx 
‘more petaloid and conspicuous, 1-2"' i aie as long as t ar From Puget 
Sound and central Idaho to the Sacramen 
**** Low slender annuals, the spikes short and dense, and the bracts imbricated; 
sepals colored. : 
13. P. POLYGALOIDES, Meisn.—Stems 2-6" high, s yee branching; leaves narrowly 
linear, ‘fe long, acute; spikes dense, 3-8'' long, the bracts closely imbricated, 2’ long, 
Dn to nearly orbicular, with broad scariou Benen ste mostly o peri stipules lan- 
eolate, entire or lacerate; s epals 1. long. or ipeni pramene 8; rater n peck the ovary; 
bys 
acheni nium 3'' long, minutely tuberculate-striate or smoothish.—Collecte ed onl pald- 
ing re hemi in Oregon — -a Idah 
14 M, Nutt., in piresi the last; often pelien ee 
1-8' i : gee okay slicers: linear or oblong, 2-4"’ long, with s 
narrow scari ute; ; styles one-third as long as pan cae: 
—Frequent in the mountains, alpine and sub-alpine, from Colorado to monii and 
northern California. It has usually been considered a form of P. coarctatum 
Meisner refers also to this section his P. Californicum, founded 
upon 1944 Hartweg, without fruit. It is separated, however, by 
every character but habit, and the remarkable peculiarities of the 
achenium require that it should be placed in a distinct section, 
not very closely allied to any other in the genus, as follows :— 
URAVIA. sno 5, colored, becoming somewhat appressed to the achenium; 
gm. 
Stamens 8, the th r filaments but slightly dilated at base; styles 3, the sti s 
capitate; achenium anas, linear, nearly terete, obscurely 3-angled; embryo 
lateral; cotyledons ac cumbent; dees owe ers in slender many- joi nted interrupted — 
gina solit aly and nearly © ? 
E S A ER 
tP. Si ee Meisn.— Annual, erect, very Slender, $6" high, minutely sca- 
brous-puberulent, brownish, the 
linear to filiform, 6-15'' be cuspidate; bracts 12” long, 3-nerved, but little , exceeding 
the stipules; calyx 1” long, rose-color; styles much x orter than the ovary; achenium 
slightly exserted, the = colored pericarp thinly m — rather een! paths 
oping the terete seed, with slightly raised angles; $ sat reddish. On dry h 
ing Sacramento and saa EEN, Californi 
