Greenman's Biscuitroot

Lomatium greenmanii Mathias, Ann. Mo. Bot. Gard. 25 : 274. 1937.
Plants low, caulescent, 0.5-0.8 dm. high, from a multicipital woody caudex; leaves oblong in general outline, excluding the petioles 1.5-2.5 cm. long, 1-2-pinnate, the ultimate divisions oblong, distinct, 5-10 mm. long, 2-2.5 mm. broad, apiculate, the margins slightly roughened; petioles 1.5-3 cm. long, purplish, sheathing below; cauline leaf 1, much reduced, pinnate; peduncles exceeding the leaves; involucel of a few, filiform, white-scarious bractlets, about equaling the pedicels; umbels reduced to 1-3 fertile umbellets, the rays 1.5-2 mm. long, and 1 or 2 sessile sterile umbellets; pedicels about 1 mm. long, the umbellets few-flowered; flowers white; fruit ovate, 3.5 mm. long, 2 mm. broad, glabrous, the wings much narrower than the body, the dorsal ribs filiform; oil-tubes solitary in the intervals, 2 on the commissure.
Type locality: Wallowa Mountains, head of Keystone Creek, Oregon, 9000 feet, Cusick 2458. Distribution: Known only from the type locality.

Lomatium greenmanii is a rare species of flowering plant in the carrot family known by the common names Greenman's desertparsley and Greenman's biscuitroot. It is endemic to Oregon in the United States, where it is found only in the Wallowa Mountains of Wallowa County.

This is a petite perennial herb with highly dissected green basal leaves each 3 to 6 centimeters long. The inflorescence is borne on a stem just a few centimeters tall. It is an umbel of tiny yellow flowers. Blooming occurs in July and August after the snow melts in its high elevation habitat.

The plant grows in the subalpine zone in rocky areas or meadows amongst conifers. Other plants in the habitat may include short-leaved fescue (Festuca brachypylla), narrow false oat (Trisetum spicatum), Cusick's desertparsley (Lomatium cusickii), dwarf mountain fleabane (Erigeron compositus), white coil-beak lousewort (Pedicularis contorta), and Mt. Hood pussypaws (Cistanthe umbellata).

This plant grows on three mountain peaks in one mountain range in northeastern Oregon. Threats include trampling by hikers and tourists visiting Mount Howard. Trampling causes the rocky substrate to become unstable and may crush seedlings.