Hypericum punctatum
Clusiaceae
Description:
Pollen monad, size class small, polar axis 22 μm, equatorial axis 14-16 μm; shape speroidal to elliptical, prolate, isopolar, equatorial shape circular to 3-lobed; tricolporate, colpus long, equal, narrowed at equator by raised extensions; ornamentation finely reticulate, perforate. Viscin absent.
Pollination Biology:
Insect pollinated, and possibly apomictic. Visited by bumble bees, which use the pollen for their larvae (Hilty,J.). Also visited by syphid flies (Syrphidae) and halictid bees (Halictidae).
Some species of Hypericum are heterostlous,, with pin and thrum flowers, and also have dimorphic pollen (Ornduff, 1975).
Tropicos Pollen Voucher
Yatskievych
Links:
Prairie Wildflowers of Illinois – Hypericum punctatum
USDA Plants – Hypericum punctatum
Species in Missouri:
Hypericum adpressum Raf. ex W. Bartram
Hypericum ascyron L.
Hypericum drummondii (Grev. & Hook.) Torr. & A. Gray
Hypericum gentianoides (L.) Britton, Sterns & Poggenb.
Hypericum gymnanthum Engelm. & A. Gray
Hypericum hypericoides (L.) Crantz
Hypericum lobocarpum Gattinger ex J.M. Coult.
Hypericum majus (A. Gray) Britton
Hypericum mutilum L.
Hypericum perforatum L.
Hypericum prolificum L.
Hypericum pseudomaculatum Bush
Hypericum punctatum Lam.
Hypericum sphaerocarpum Michx.
References:
Hilty, J. Editor. 2010. Insect Visitors of Illinois Wildflowers. World Wide Web electronic publication. flowervisitors.info, version (04/2010).
Ornduff, R. 1975. Heterostyly and pollen flow in Hypericum aegypticum (Guttiferae). Botanical Journal of the Linnean Society, 71:51–57.