Reproductive biology of a North American subalpine plant: <i>Corydalis caseana</i> A. Gray ssp. <i>brandegei</i> (S. Watson) G. B. Ownbey
Abstract
Abstract Corydalis caseana ssp. brandegei (Fumariaceae) is a perennial plant that grows in moist, subalpine regions of south central Colorado, USA. Prior to this study, nothing was known of its reproductive biology. The most numerous visitors (59%), and the only known pollinators, were long‐tongued bumblebees ( Bombus appositus ). Twenty‐nine percent of visits were from short‐tongued nectar‐robbing bumblebees ( Bombus occidentalis ). Hummingbirds also visited the flowers but they did not pollinate them. Corydalis caseana flowers remained open and in good condition for approximately 4 days. During that time, in the absence of visitors, nectar containing 35% sugar accumulated at a rate of approximately 1 μ L per day. Corydalis caseana has a mixed‐mating system. It is self‐fertile, but the self‐fertilized flowers produce fewer seeds per fruit than the outcrossed flowers (a mean of 2.9 compared with a mean of 4.7). Results suggest a possibility of inbreeding depression.
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