Spellenberg, Richard; Rodriguez T., Sergio
June 1992
Acta Botanica Mexicana;jun1992, Issue 18, p17
Academic Journal
Chromosome numbers are reported for 18 taxa of Astragalus (Fabaceae) from northern Mexico and the southwestern United States. Twelve are reported for the first time and are as follows: COUNTS FROM BUDS: (n = 11) A. cyaneus, A. eremiticus, A. insularis var. harwoodii, A. proximus; (n = 14) A. hartwegii; (n = 15) A. goldmanii, A. zacatecanus; COUNTS FROM SEEDS: (2n = 22) A. cottamii, A. holmgreniorum, A. humillimus, A. wittmanii; (2n = 28) A. vaccarum. Six confirm earlier reports and are: COUNTS FROM BUDS: (n = 11) A. cobrensis var. maguirei, A. fucatus, A. lentiginosus var. variabilis, A. longissimus, A. mollissimus var. ?; (n = 15) A. diphacus. Second and third records for the species, and a new record for Durango, are reported for A. zacatecanus, a species formerly known only from the type collection. An emendation of the description is made based on the morphology of the new collections. A brief discussion regarding the significance of the chromosome numbers is presented, noting that higher chromosome numbers are characteristic for certain Mexican groups of Astragalus.


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