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94 MISSOURI BOTANICAL GARDEN. 
adenocaulon, from which this species appears barely separa- 
ble by the more elliptical form and sharper serration of its 
leaves, and its more cinereous pubescence. — Monogr. 
260.— New Mexico (Fendler, 1847, no. 217, in part; and 
Bigelow, on Whipple’s Exped. 1853-4). — Plate 20. 
E. AMERICANUM, Hausskn., Oesterr. Bot. Zeitschr. xxix. (1879), 118, 
and Monogr. 260, founded on specimens collected in the Saskatchewan 
region (Bourgeau, Aug. 1857), would appear to differ from adenocaulon 
only in its more sparing pubescence and smaller acute leaves, and I cannot 
separate it. According to Haussknecht, small plants of Americanum oc- 
cur in the herbarium of the Museum at Paris, which are labeled ‘‘Z. tenel- 
lum, Raf. Mts. Catskill, Et. Un. leg. Rafinesque,’”? — but which are said 
not to agree with Rafinesque’s description of Z. tenellum (Z. palustre). 
Such specimens seem to come very near what I regard as a very dwarf 
erect-leaved form of adenocaulon, collected in the White Mountains of 
New Hampshire (Miss Prince), the Catskills of N. Y. (Peck, 1880), on the 
Pic River (Loring, in Hb. Gray.), on Prince Edward Island (Macoun), 
and in the Rocky Mountains (Bourgeau, 1858, in hb. Gray., etc.), — 
which may be the £. ciliatum of Rafinesque in Journ. Bot. i. (1808), 
229. These have crisp-pubescent peduncles, etc. As yet, however, 
there is too much uncertainty about the matter to warrant the 
application of the name ciliatum to either plant, unless for this dwarf 
form (Plate 22) either as a variety under adenocaulon or as a valid 
species immediately preceding it. 
19. E. apenocauton, Hausskn. — Habit of the preced- 
ing, the inflorescence, capsules, etc. very glandular pubes- 
cent and with few if any incurved hairs; leaves 50 or ex- 
ceptionally 70 mm. long, frequently erect, elliptical to 
mostly ovate-lanceolate, obtuse, only slightly serrulate or 
denticulate, abruptly rounded to short winged petioles, 
rather pale green and glossy, glabrous except the upper- 
most, which are gradually reduced and seldom as rugose as in 
coloratum ; flowers (mostly nodding at first) and capsules 
as in coloratum; seeds obovoid, .8x 1.1 mm., abruptly 
short beaked ; coma white. — Oesterr. Bot. Zeitschr. xxix. 
(1879), 119; Monogr. 261. — #. coloratum, in part, of 
most writers on the flora of the eastern and middle States; 
E’. tetragonum of most writers on western botany, but not 
of Linnzeus. — New Brunswick to Oregon, south to Penn- 
sylvania, Utah and California: the Pacific Coast forms 
