CHEOMOSOME COUNTS FROM NEW MEXICO AND SOUTHERN COLORADO Darrell E. Ward Department of Biology New Mexico State University Las Cruces, New Mexico 88003 U.S.A. The counts reported here are the result of general collecting in New Mexico and southern Colorado. Most agree with previously published counts, however, a few are unique and may provide clues suggesting intraspecific chromosomal variation, and the majority of them expand the cytogeographical knowledge of certain species into this area. Floral buds were collected into modified Carney's solution (4 chloroform: 3 absolute ethanol: 1 acetic acid) and then stained in Snow's (1963) hydrochloric acid-carmine stain. Voucher are deposited at NMC; dupes of some are at NY, TEX, MO, or UNM. The following codes for collectors are used in the listing: RJS = Robert Soreng, RWS = Richard Spellenberg, T = Thomas Todsen, and W = Darrell Ward. ASTERACEAE Acourtia nana (A. Gray) Reveal & King. n=27. NM, Luna Co., N end of Sierra Rica Mtns., 2.5 air km ENE of right angle in U.S.-Mexican boundary. I^ k £K£ 80-002 . Aster corom utatus (Torr. & Gray) Gray var. comm utatus . n=15. NM, McKinley Co., 3 km S of Fort Wingate, roadside of NM-400. Aster exilis Ell. n=5. NM, Grant Co., Faywood Hot Springs, N of intersection of NM-61 and US-180. MS 6208 . Bahia absinthifolia Benth. var. dealbata (A. Gray) A. Gray. 2n=24ll + 2B. NM, Dona Ana Co., 5 km E of Las Cruces. ^ 81-065 . All cells examined had two spherical supernumeraries which were smaller than the rest of the chromosomes present. Bahia opp ositifolia (Nutt.) DC. n=24. NM, Harding Co., 3 km W of Mills. RWS. BJS & a 6006 . Berlandier a ly ^gta Benth. var. lyrata . n=15. NM, Sierra Co., NM-52 roadside, 30 km NW of Cuchillo. iS i. T 81-167. Bidens tenuisecta Gray. n=24. NM, Luna Co., roadside of NM-61, 5.5 km S of Faywood. RKS 6211. Brickellia simplex Gray. n=9. NM, Hidalgo Co., Peloncillo Mtns., Skull Canyon, ii h T 81-412 . Erigerop colo-piexicanus A. Nels. n=27. NM, Dona Ana Co., Organ Mtns., Dripping Springs Canyon, 17 km E of Las Cruces. M 81-076 : and Harding Co., 16 km NNW of Mills. BK£ £i al* 6040 . Pollen fertility of the specimen, as determined by cotton-blue staining, is very low (19% stained). Erigeron divergens Torr. & A. Gray var. divergens. n=lB. NM, Dona Ana Co., 0.8 km W of Organ, US-70 roadside. K & EMS 81-020 . 302
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