Dasylirion genus atque affinia novis speciebus mexicanis. 115 
Dasylirion hookeri Lemaire, Hort. Belg., XV, 324, 1865. 
Beaucarnea hookeri Baker, Journ. Bot., 1872, 327, 1872. 
Plant body proper 30 to 100 cm in diameter covered with a thick 
corky bark like that of an oak, within of loose cellular structure, resting 
upon the ground like a puffball and attached to the earth only by small 
fibrous roots; leaves 30 to 90 cm long, linear, 2 to 2,5 mm broad, pale 
green, sligthly serrulate, striate; panicle 10 to 20 em long, about 10 cm 
broad, the horizontal branches quite rigid; segments of the flower orbi- 
cular, scarious-margined, purplish; fruit 5 to 7 mm in diameter. 
Speeimens examined. 
San Luis Potosi: Near City of San Luis Potosi, C. R. Orcutt, 
1903 (trunk only); Dr. E. Palmer, 1905 (numerous plants but no, 
flowers). 
Hidalgo: Near Ixmiquilpan, Rose & Painter, 1905 (no. 8954) with 
male and female flowers and immature fruit; Dr. C. A. Purpus, same 
date and place; also later, in fruit. 
8. Nolina elegans Rose, |. c., p. 91. 
Probably acaulescent; leaves 50 to 60 cm long, 9 to 12 mm broad 
stiff, yellowish, both surfaces smooth, the margins serrulate; inflorescence 
a narrow panicle, 1 to 3 meters long; flowering branches ascending; 
bractlets scarious, their margins lacerate; pedicels 8 to 9 mm long, 
jointed a little above their base; sepals obtuse, scarious-margined; fruit 
strongly 3-lobed, 7 to 10 mm broad, broader than high, the walls thin 
but not bursting before the ripening of the seeds. 
Mexico: This species is probably common in the mountains of 
Chihuahua, Durango, and Zacatecas. 
Zacatecas: In the mountains, J. N. Rose, August 18, 1897 
(no. 2396). 
Durango: Dr. E. Palmer, 1896 (no. 249); E. W. Nelson between 
El Oro and Guanacevi, August, 1898 (no. 4745). 
Chihuahna: Townsend & Baker, near Colonia Garcia, June, 1899 
(no. 76). , 
Nolina elegans has been confused in collections with both N. micro- 
carpa and N. recurvata. From the former it differs in its broader, stiffer 
leaves, larger fruit, &c. From the latter it is generically distinct, and 
it is needless to point out the differences here. 
9. Nolina nelsoni Rose, |. c., p. 92. 
Trunk 1 to 3 meters high; leaves 50 to 70 em long, 3 to 4 cm 
broad above the base, gradually tapering to a point, both surfaces smooth, 
the margins serrulate; inflorescence, including the peduncle, 2 to 3,5 
meters long; bracts scarious, lacerate; pedicels 5 to 6 mm long, jointed 
near the middle; sepals ovate, obtuse, scarious-margined; mature fruit 
not seen. 
Mexico: Type specimen U. S. National Herbarium no. 332674, 
collected by E. W. Nelson near Miquihuana, Tamaulipas, June 10, 
1898 (no. 4489). 
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