Physocarpus malvaceus

Rocky Mts.—Colorado.  Larimer Co.: Roosevelt Natl. Forest, Hwy 14, ~30 mi west of Fort Collins along the Cache La Poudre River; 40º41'53.5", 105º26’30.2”, 1982 m.  Pine forest-desert transition. SPJ-16410, 03 Aug 2008

Physocarpus sp.

Idaho. St Joe NF: Giant White Pine along Hwy 6 and Mannering Creek, 1/4 mi S of campground, near private land; 47º00.368, 116º40.612, 2771 ft.  Wet fern-sedge meadow with high density of Veratrum californicum var. caudatum, surrounded by forest of western  red cedar, grand fir and western white pine, with understory shrubs of Alnus, Viburnum and Frangula purshiana.  6 Aug 2009.

Physocarpus malvaceus
Jarbidge, NW NV, June 2005

Physocarpus capitatus

Physocarpus opulifolius

Kim YK, Yoon SK, Ryu SY.  2000. Cytotoxic triterpenes from stem bark of Physocarpus intermedius. Planta Med. 66(5): 485–486. “Seven triterpenes (1-7), i.e., betulinic acid 1, ursolic acid 2, oleanolic acid 3, 3-O-caffeoyloleanolic acid 4, euscaphic acid 5, 2 alpha-hydroxyursolic acid 6 and maslinic acid 7 were isolated from the stem bark extract of P. intermedius as active principles responsible for the cytotoxicity against five cultured human tumor cell lines, i.e., A549 (non small cell lung), SK-OV-3 (ovary), SK-MEL-2 (melanoma), XF498 (central nerve system) and HCT-15 (colon), in vitro.”