Diodia teres Walter

03373086
Ada Hayden Herbarium
Iowa State University
Flora of Iowa
Diodia teres Walter
Wapello County: T71N R13W Section 31 SW4 NE4 NW4 NE4
UTM (15T, NAD27): 550809 East, 4528961 North
Pioneer Ridge Nature Area is about 6 miles south of Ottumwa. An
approximately 2 acre, below average quality dry-mesic tallgrass prairie (it may
have been crop ground at one time) occurs southeast of a gravel parking lot
and south of 20th Street. The prairie is on a moderate, east/southeast-facing
slope. The soil at the collection site is mapped as Galland loam, 14 to 18
percent slopes, moderately eroded (594E2), an Aquic Hapludalf. Pioneer
Ridge Nature Area is on the Southern Iowa Drift Plain.
Diodia teres is locally common in the prairie. Pale lavender flowers occur in
the upper 1 to 3 axils, with fruits below. Diodia teres is locally dominant on
very eroded, sparsely vegetated, light reddish brown soil. It is associated with
Ambrosia artemisiifolia. Andropaon virainicus. Aster ericoides. Carex hirsutella.
Chamaecrista fasciculata. Eupatorium altissimum. Paspalum setaceum. Poa
compressa. Prunella vulgaris, Pvcnanthemum pilosum. Solidaao nemoralis and
Tridens flavus.
MarkJ. Leoschke 2219
September 1,2001