Abstract
Johnson, B. Lennart. (U. California, Los Angeles.) Natural hybrids between Oryzopsis and Stipa. III. Oryzopsis hymenoides × Stipa pinetorum. Amer. Jour. Bot. 50(3): 228–234. Illus. 1963.—On the basis of morphological characters, the spontaneous hybrid Oryzopsis hymenoides × Stipa pinetorum is included in 0. bloomeri which consists of a number of sterile, natural hybrids between O. hymenoides (2n = 48) and various American species of Stipa (2n = 32‐82). While intermediate between its parents in many attributes, the pinetorum hybrid is different from the other hybrids included in O. bloomeri with respect to lemma‐hair length and other characters which are diagnostic for S. pinetorum (2n = 32). The hybrid has 2n = 40 chromosomes, but some plants of the hybrid and some of O. hymenoides had small supernumerary, somatic chromosomes. The parents formed only bivalents at meiosis. The hybrid showed some affinity among 14 chromosomes per sporocyte. This affinity is nearly as great as that shown by other Stiporyzopsis hybrids with 56 or 58 chromosomes, and is consistent with the earlier suggestion that bivalent formation in polyploid species of Stipa may be gene‐controlled.
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