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monogeneric family comprising ≈100 Cycas species ( Hall, 2011 ; Kono and Tobe, 2007 ). All cycad studies to date have shown that wind plays a minimal, if any, role as a pollen vector. A few questions remain concerning the pollination of some Cycas species

Agricultural Experiment Station, under Project No. 746. I extend thanks to Robert L. Wick, Department of Microbiology, University of Massachusetts, for identifying fungi in stored pollen. The cost of publishing this paper was defrayed in part by the payment of

, 1951 ); and in 2005, three-fourths of the United States' watermelon production was devoted to triploid cultivars ( USDA, Economic Research Service, 2005 ). In triploid watermelon production, diploids are included as a viable pollen source for

pollen that can be transferred onto native lantana’s flowers by pollinators. Dehgan (2006) indicated the existence of a wide range of pollen stainability (from less than 5% in Patriot™ ‘Sunburst’ to more than 80% in ‘Professor Raoux’) in L . camara

Soria, 1968 ; Falque et al., 1995 , 1996 ; Glendinning, 1963 ; Iwaro et al., 2003 ; Lachenaud, 1994 , 1995 ). A number of studies have described the specific effect of pollen parent on yield and some pod characteristics ( Iwaro et al., 2003

‘Mario Pollsa’ porterweed ( Stachytarpheta spp.). Through controlled crosses, the potential for nettleleaf porterweed to hybridize with jamaican porterweed was realized. However, there is a lack of information, such as ploidy level and pollen

, 2006 ). Unlike diploid plants, triploid watermelon plants do not produce sufficient viable pollen to pollenize themselves ( Maynard, 1992 ; Maynard and Elmstrom, 1992 ). To achieve optimal triploid watermelon yields, 20% to 33% of the plants in the

compatibility groups is used to identify cross-compatible cultivars for field planting ( Matthews and Dow, 1969 ). Yet, despite the availability of compatible pollen and abundant flowers, fruit set in both sweet and sour cherry is frequently less than adequate

excessive self-pollination ( Marquard, 1988 ), lack of pollen availability at time of stigma receptivity ( Wood, 1997 , 2000 ; Wood and Marquard, 1992 ), or pollen-stigma incompatibilities ( Wood et al., 1997 ). Successful fertilization involves transfer

because they can be readily crossed with watermelon cultivars, they are obvious candidates for use in breeding programs. However, high levels of marker segregation distortion, low fruit set, and diminished pollen viability have been observed in mapping