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URTICA URTICACEZ 603 
PARIETARIA 
U. Lyallii Watson 1. c: More or less pubescent, becoming nearly 
glabrous. with scattered bristles: stems slender, 4-6 feet high: stipules 
large, membranaceous, broadly oblong, obtuse: leaves ovate, somewhat 
cordate at base, acute, 3-9 inches long or more, coarsely serrate, on slenver 
petioles 1-4 inches long; flowers in loose slender spreading panicles, equall- 
ing or shorter than the petioles: sepals broadly ovate or rounded, obtuse, 
shorter than the broadly ovate achene, which is % ofaline long. Along 
streams, Brit. Columbia to California, 
U. gracilis Ait. Hort. Kew. iii, 341. Perennial with long creeping 
yellow rootstocks armed with stinging hairs: stems erect, mostly simple, 
2-7 feet high: leaves lanceolate to ovate, long-acuminate, coarsely and 
sharply serrate, sparingly pubescent, 2-7 inches long, narrowed to rounded 
or subcordate at base, on slender petioles shorter than the blade: stipules 
lanceolate: flower-clusters compound, commonly longer than the petioles. 
In rich soil, along streams, Alaska to California and across the continent. 
2 PARIETARIA L. Sp. 1052. 
Low annual or perennial herbs, the hairs not stinging, with 
alternate leaves without stipules and small greenish polygamous 
flowers in axillary involucrate clusters. Calyx in the perfect 
flowers 4-parted ; in the pistillate tubular-ventricose and 4-cleft, 
with connivent lobes. Style slender or none; stigma spatulate 
recurved, densely tufted. Achene ovoid, enclosed in the dry calyx’ 
P. debilis Forster Weddell in DC. Prodr. xvi, 235. A very slender 
annual, 3-12 inches high, usually diffusely branched from the base, some- 
what hispid: leaves broadly ovate, obtuse, rounded at base or abruptly cun- 
eate, 2-6 lines long or more, on petioles about as long as the blade: clusters 
few-flowered: bracts linear or narrowly oblong, 4-1 line long, about equal- 
ling the flowers: achenes¥¢ a line long. Southern Oregon to Ualifornia and 
eastward..: . 
P. Pennsylvanica Muhl. Willd. Sp. iv, 955. A pubescent annual: 
stem weak, simple or sparingly branched, ascending or reclining, very 
slender, 4-15 inches high: leaves lanceolate or oblong-lanceolate, mem- 
branaceous, dotted, acuminate at the base, 3-nerved and with 1-3 pairs of 
weaker veins above, slender-petioled, 1-3 inches long: flowers glomerate in 
all except the lowest axils, the clusters shorter than the petioles: bracts of 
the involucre linear, 2-3 times as long as the flowers: style almost none: 
achenes about % line long. In dry rocky places, Brit. ‘Columbia to 
eastern Oregon and the Eastern States. 
OrpErR LXXXIII EUPHORBIACE J. St. Hil. 
Expos. Fam. 276. (1805.) 
‘Herbs shrubs or trees with acrid often milky juice, alternate 
opposite or verticillate leaves with or without stipues and 
monecious or dicecious flowers variously disposed. Flowers 
mostly apetalous, sometimes the calyx also wanting or repre- 
sented by a scale at the base of the stamens, in Euphorbia 
subtended by an involucre that resembles a calyx. Stamens 
one tomany. Ovary usually 3-celled with one or two pendulous 
ovules in each cell.. Stylesas many as cells of the ovary, sim- 
ple, divided or many-cleft. Fruit a mostly 3-celled, elastically 
ehiscent capsule. Seeds anatropous, with astraight or slightly 
curved embryo in fleshy or oily albumen. 
