Artemisia ludoviciana subsp. mexicana (Willd.) Keck

Artemisia muelleri Rydberg, sp. nov
^Artemisia mexicana latifolia Schultz-Bip. in herb.
A tall perennial, with a rootstock; stem about 1 m. high finely tomentose-striate; leaves alternate, sessile, linear-lanceolate, 5-10 cm. long, 5-15 mm. wide, usually entire, rarely with a few narrow lobes, loosely floccose and glabrate above, densely white-tomentose beneath; heads numerous in a leafy panicle, nodding; involucre hemispheric or turbinate, 3 mm. high and broad; bracts 10-12, in about 3 series, arachnoid-tomentose, the outer ovate, half as long as the innermost; inner bracts elliptic, obtuse; ray-flowers 10-12; corollas 1.5 mm. long; diskflowers 5-8; corollas 2 mm. long; achenes about 1 mm. long.
Type collected at Orizaba, 1853, Fred. Mueller 1S68 [field no.] or 235 [distrib. no.] (herb. N. Y. Bot. Gard.).
Distribution: Vera Cruz to Hidalgo and Jalisco.

Artemisia ghiesbreghtii Rydberg, sp. nov
A tall perennial, with a rootstock; stem grooved, sparingly tomentose, 5 dm. high or more; leaves narrowly lance-linear, 2-8 mm. broad, 5-15 cm. long, green and slightly floccose or glabrate above, white-tomentose beneath, the upper entire, the lower often 2or 3-lobed above the middle, if 3-lobed the lateral lobes usually opposite and spreading; inflorescence large, open, with elongate racemiform branches and nodding heads; involucre broadly campanulate, 4-5 mm. high and fully as broad, sparingly floccose; bracts 13-15, in 3 series, ovate or oval, obtuse, with yellow scarious margins; ray-flowers 5-7; corollas 1 mm. long; disk-flowers 10; corollas yellow, funnelform, glandular-granuliferous below, 2 mm. long; achenes 1 mm. long.
Tjrpe collected in Chiapas. Ghiesbreght 1551 (herb. Columbia Univ.). Distribution; Chiapas to State of Mexico.

Artemisia neomexicana Greene, sp. nov
^rtemjiia «<io/««i Wooton & Standley, Contr. U. S. Nat. Herb. 19:739. 1915. Not A. redolens A. Gray. 1886.
A perennial, with a creeping rootstock ; stems about 5 dm. high, slightly floccose when young, soon glabrous, striate; leaves alternate, numerous, sessile, 3-7 cm. long, pinnately divided into few linear diisions, 1—2 mm. wide, or some entire, light-green and glabrate above, whitetomentose beneath; heads very numerous in a narrow dense leafy panicle, crowded; involucre hemispheric, 3 mm. high and 4 mm. broad ; bracts about 1 0, in 3-4 series, yellowish, only slightly arachnoid when young, the outermost narrowly lanceolate, not much shorter than the innermost; inner bracts oval, obtuse, broadly scarious-margined ; ray-flowers 12-15; corollas 1.5 mm. long; disk-flowers 12-18; corollas yellow; achenes nearly 1.5 mm. long.
Type collected in a grassy glade, Hillsboro Peak, Black Range, New Mexico, August 25, 1904, Metcalfe 1248 (herb. N. Y. Bot. Gard.).
Distribution: Southern New Mexico and northern Chihuahua.