507 
Gray (loc. cit.) says: “‘ From the shape of the leaves, and their size and abundance 
up to the summit of the stem, this should rather be referred to /. macranthum; but 
the pubescence is strange for that species;” and in the Synoptical Flora he adds, 
‘‘Perhaps a distinct species.” I believe it to be distinct and rather more related to 
£. macranthus than to E. glabellus; in fact, it differs little from the former except 
in the pubescence, which is not only more copious but of a different nature, more 
resembling that of the hirsute forms of /. glabellus. In E. macranthus the bracts 
are nearly smooth, somewhat minutely glandular or puberulent; in E. subtrinervis 
they are covered with longer spreading hairs. I have named the species E. subtri- 
nervis, from the fact that the lower lateral veins are often stronger, making the 
leaves look as if triple-nerved, a character often seen in FE. speciosus, sometimes in 
FE. macranthus, though I have not seen it in /. glabellus. The leaves are generally 
thinner than in any of these three related species. 
In woods: Custer, altitude, 1,700 n., August 16 (No. 779). 
Erigeron pumilus Nutt. Gen. ii, 147 (1818), 
Dry table-lands: Hot Springs, altitude 1,100 m,, June 13 (No. 780). 
Erigeron compositus Pursh, Fl. ii, 585 (1814). 
All my specimens are strictly scapose and densely matted. Exposed rocks in the 
Limestone District, altitude 1,900 m,, July 27, Also seen near the Needles, altitude 
about 2,100 m., in the Harney Range (No, 781). 
Erigeron canus Gray, Pl. endl. 67 (1849). 
Dry table-lands: Hot Springs, altitude 1,100 m., June 13 (No. 782). 
Erigeron philadelphicus L. Sp. PI. ii, 863 (1753). 
Near water: Hot Springs, altitude 1,050 m., June 17; Hermosa, altitude 1,000 m., 
June 22; Elk Canyon, altitude 1,200 m., June 29 (No. 783). 
Brigeron flagellaris Gray, Pl. Pend]. G8 (1849), 
Rich soil: Hot Springs, altitude 1,050 m., June 17; Hermosa, altitude 1,000 m., * 
June 22; Buckhorn Mountain, near Custer, altitude 1,800 m., July 14. The speci- 
mens from the latter place, have much smaller radical leaves than the rest (No. 784). 
Erigeron ramosus beyrichii (Fisch. & Mey.) Smith & Pound, Bot. Sury. Nebr. ii, 
11 (1893) ; Stenactis beyrichii Pisch. & Mey. Ind, Sem, Petrop, 27 (1824). 
Below Buckhorn Mountain, Custer, altitude 1,700 m., August 14 (No, 785). 
Erigeron armerifolius Turez.; DC. Prodr. v, 291 (1836), 
Radical leaves numerous, spatulate. Wet meadow, Custer, altitude 1,700 m., 
August 20 (No. 786). 
Erigeron canadensis L. Sp. Pl. ii, 863 (1753). 
This is rare in the Black Hills. Custer, altitude 1,650 m., August 20 (No, 787). A 
depauperate form, resembling much £. diraricatus, was collected in Ruby Glen, Cus- 
ter, altitude 1,700 m., August 20 (No. 788), 
Pilago prolifera (Nutt.) Britton, Mem. Torr. Club, v, 329 (1894); Evax prolifera 
Nutt.; DC. Prodr. v, 459 (1836), 
sarren Hills: Hot Springs, altitude 1,100 m., June 13 (No. 789), 
Antennaria dioica (L.) Giertn. Fruct, ii, 410 (1791); Gnaphalium dioicum L. Sp. 
Pl. ii, 850 (1758). 
The typical 4. dioica has leaves 1 to 2 cm, long, and 0.3 to 0.6 em. wide, silvery 
white on both sides; bracts all obtuse, the papery portion white or pinkish red. 
Borders of woods: Hot Springs, altitude 1,100 m., June 13; Rochfort, altitude 
1,600 m., July 11 (No. 790). 
A peculiar form with several crowded heads, and often acute bracts, I also refer 
here. The bracts are of livid-brownish color, approaching A. alpina in this respect, 
but the plant is in every respect larger. Custer, altitude 1,700 m., July 4 (No. 792). 
Antennaria dioica parvifolia (Nutt.) Torr. & Gr. Fl, ii, 431 (1840); Antennaria 
parvifolia Nutt. Trans, Amer. Phil, Soc. n. ser. vii, 406 (1841). 
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