Pollination Biology of Potentilla recta (Sulfur Cinquefoil) and Its Cooccurring Native Congener Potentilla gracilis in Northeastern Oregon

Table 2

Phenology of ten most commonly observed flower visitors of Potentilla gracilis (native) and P. recta (exotic), at four sites in Northeastern Oregon, 2002–2004.

Pollinator species	May 16–31	June 1–15	June 16–30	July 1–15	July 16–31
P. gracilis
Coenonympha tullia	46.2	38.5	15.4
Trichodes ornatus	12.5	37.5	40.6	9.4
Panurginus sp.	10.5	62.1	25.3	2.1
Halictus ligatus	4.8	42.9	52.4
Ceratina nanula		97.6		2.4
Lasioglossum olympiae		85.7	14.3
Lasioglossum sisymbrii		76.5	23.5
Eristalis hirta		70.7	14.6	14.6
Apis melifera		50.0	42.9	7.1
Hylaeus episcopalis		6.7	66.7	26.7
P. recta
Halictus ligatus		42.9	21.4	28.6	7.1
Bombus rufocinctus		7.1		92.9
Bombus bifarius		5.3	47.4	47.4
Eristalis hirta		3.3	76.7	20.0
Apis melifera		1.2	64.7	32.9	1.2
Lasioglossum sisymbrii			42.1	57.9
Hylaeus episcopalis			38.1	61.9
Andrena pronorum			36.4	63.6
Halictus tripartitus			12.0	64.0	24.0
Ceratina nanula				72.0	28.0