Morphology and Pollination Biology of an Intersectional Hybrid of Costus (Costaceae)
1985; American Society of Plant Taxonomists; Volume: 10; Issue: 3 Linguagem: Inglês
10.2307/2418599
ISSN1548-2324
AutoresKenneth J. Sytsma, Richard W. Pippen,
Tópico(s)Botanical Research and Applications
ResumoAn intersectional hybridization event between hummingbird-pollinated Costus pul- verulentus (sect. Ornithophilus) and large bee-pollinated C. guanaiensis var. macrostrobilus (sect. Costus) in Belize, Central America, is documented by analyses of morphology and pollination biology. Morphologically the hybrid is intermediate between the parental species and retains floral char- acteristics adaptive to both hummingbird and bee pollination. Nectar secretion rate and sugar concentration but not sucrose:hexose ratio in the hybrid are intermediate between those of the parental species. The hybridization event probably arose by breakdown of strict hummingbird pollination in Costus pulverulentus. Costus L. (Costaceae) occurs in moist habitats in the Neotropics, and is characterized by a spi- rally arranged phyllotaxy and showy terminal inflorescence. Costus is often found associated with species of Calathea, Canna, Heliconia, and Renealmia along the banks of rivers and streams and more disturbed habitats like forest trails, secondary forests, lightgaps, roadsides, and
Referência(s)