Micranthes oregana (Howell) Small

Micranthes arnoglossa
Insert the synonyms: Saxifraga arnoglossa Fedde, Bot. Jahresb. 33: 613. 1906. Saxifraga subapetala normalis A. Nelson, Bot. Gaz. 42: 53. 1906.

Micranthes arnoglossa Small, sp. nov
Leaves ascending or spreading, 6-19 cm. long, the blades oblong to elliptic, sometimes narrowly so, remotely glandular-denticulate, ciliolate and sometimes sparingly pubescent, each narrowed to a dilated sheathing base ; scapes erect, typically solitary, 30-70 cm. tall, stout, glandularpubescent, sometimes closely so, rather widely paniculate above ; cjTnules aggregated into clusters terminating the inflorescence-branches ; sepals broadly ovate to deltoid, 1.5-3 mm. long, generally eciliate; petals white, mainly oblong to elliptic, 3-3.5 mm. long, with broad claw-like bases ; filaments subulate ; follicles about 4 mm. high, often purplish, the stout tips spreading or somewhat recurved.
Type collected at Marshall Pass, Colorado, July 19, 1901, by C. F. Baker, no. 509. Distribution : Montana and Idaho to Colorado.

Micranthes brachypus Small, sp. no v
Leaves spreading, 6-13 cm. long, the blades oblong to elliptic, remotely glandulardenticulate, glabrous or nearly so, except the ciliolate margins, the sheathing bases short ; scapes solitary, 2-4 dm. tall, sparingly glandular-pubescent, narrowly paniculate above; cj^mules aggregated at the ends of the short inflorescence-branches; sepals ovate, 1.5-2 mm. long, eciliate; petals white, oblong or nearly so, 3-3.5 mm. long, clawless; filaments subulate ; follicles 3^ mm. long, green or purplish, the very short tips spreading.
Type collected at Marlette Lake, Nevada, July 29, 1902, by C. F. Baker, no. 1395, Distribution : Colorado to Nevada.

Micranthes sierrae (Coville) Heller, Muhlenbergia 2 : 52. 1905
Saxifraga integrifolia Sierrae Coville, Proc. Biol. Soc. Wash. 7 : 78. 1892. Saxtfraga Sierriae Small, Bull. Torrey Club 23 : 366. 1896.
Leaves erect or ascending, 4-20 cm. long, or sometimes longer, the blades oblong or elliptic to oblong-spatulate , remotely glandular-denticulate, sometimes sparingly pubescent and ciliolate, gradually narrowed to the dilated scarious partly sheathing base ; scapes erect, typically solitary, stout, 20-70 cm. tall, thinly glandular-pubescent, paniculate above, sometimes narrowly so ; cymules aggregated into clusters terminating the ascending or erect branches of the inflorescence; sepals deltoid to ovate, 1.5-2 mm. long, eciliate; petals white, elliptic to oblong, 2-2.5 mm. long, clawless; filaments subulate; follicles 3.5-4mm. high, often purple, the stout tips spreading.
Type locality : Headwaters of the Kern River, Tulare County, California. Distribution : Sierra Nevada mountains, California.

Micranthes oregana (Howell) Small
Saxifraga oregana Howell, Erythea 3: 34. 1895.
Leaves erect or ascending, 3-11 cm. long or longer, the blades oblong to elliptic or ovate -elliptic (greatly elongated and broadly linear to linear-spatulate on plants growing in water), crenulate or minutely glandular-denticulate, typically glabrous except the ciliolate margins, each with a short sheathing base ; scapes erect, typically solitary, stout, 30-100 cm. tall, rather copiously glandularpubescent, widely paniculate above; cymules aggregated into clusters terminating the inflorescence-branches; sepals ovate to halforbicular, about 2 mm. long, eciliate ; petals white, oval to suborbicular, 3.5-4 mm. long, clawless ; filaments subulate ; follicles 4-5 mm. long, green, the short stout tips spreading.
Type locality : Oregon and Washington. Distribution : Washington to California.

Micranthes montanensis Small
Saxifraga montanensis Small, Bull. Torrey Club 23: 367. 1896.
Leaves erect or ascending, 3.5-14 cm. long, the blades various, often ovoid-oval, narrowly oblong-lanceolate and spatulate on the same plant, entire or glandular-denticulate, often sparingly pubescent, especially about the veins beneath, narrowed to the broad partly sheathing bases ; scapes erect, typically solitary, or sometimes 2 or 3 together, stout, 28-60 cm. tall, finely glandular-pubescent throughout, paniculate above; cymules aggregated into clusters terminating the ascending or nearly erect branches of the inflorescence ; sepals ovate to triangular-ovate, 1-2 mm, long, 3-veined, eciliate ; petals greenish, nearly oblong or elliptic, mainly broadest above the middle, 1-2.5 mm. long, clawless ; filaments subulate ; follicles about 3 mm. high, green, the short stout tips spreading.
Type locality : Southeastern Montana. Distribution : Montana.

Micranthes oregana is a species of flowering plant known by the common name Oregon saxifrage. It is native to western North America, including the mountainous regions of the western United States. It can be found in moist habitat, such as marshes and other wetlands. It is a perennial herb growing from a thick, fleshy or woody caudex. It produces a basal rosette of linear to lance-shaped leaves each up to 25 centimeters long. The inflorescence arises on a stout peduncle which may exceed a meter in height. It is topped with one or more dense clusters of white-petaled flowers.

Micranthes oregana là một loài thực vật có hoa trong họ Saxifragaceae. Loài này được (Howell) Small miêu tả khoa học đầu tiên năm 1905.