Snowline Springparsley

Cymopterus nivalis S. Wats. Bot. King's E)xpl. 123. 1871
Pseudoreoxis nivalis Rydb. Bull. Torrey Club 40: 73. 1913. Pseudocymoplerus nivalis Mathias, Ann. Mo. Bot. Gard. 17: 327. 1930.
Plants acaulescent, 5-15 cm. high, cespitose from a long slender taproot; leaves narrowly oblong in general outline, excluding the petioles 1.5-5 cm. long, 0.5-1.5 cm. broad, pinnate, rough-puberulent, the leaflets entire to pinnately lobed, remote, the lobes linear to ovate, acute, 1-10 mm. long, 1-4 mm. broad, distinct; petioles 1-8 cm. long; peduncles exceeding the leaves, 4-10 cm. long; involucre wanting; involucel dimidiate, of linear, acute, subconnate bractlets about equaling the flowers; umbels compact, the rays several, less than 5 mm. long; flowers white or pinkish; mature fruit unknown, the immature ovoid-oblong, about 1.5 mm. long, about 1 mm. broad, the wings thin; oil-tubes inconspicuous.
Type locality: "East Humboldt Mountains," Nevada, 9000 feet, Watson 448. Distribution: Central Idaho to northeastern Nevada (Davis 2018).

Cymopterus bipinnatus S. Wats. Proc. Am. Acad. 20: 368. 1885
Pseudocymopterus bipinnatus Coult. & Rose, Rev. N. Am. Umbell. 75. 1888. Cynomarathrum Macbridei A. Nelson, Bot. Gaz. 54: 142. 1912. Pseudoreoxis bipinnatus Rydb. Bull. Torrey Club 40: 73. 1913.
Plants acaulescent, 2-26 cm. high, cespitose from long, slender tap-roots; leaves narrowly oblong in general outline, excluding the petioles 1.5-6.5 cm. long, 0.5-1.5 cm. broad, bipinnate, gray-green, rough-pubcrulent, the leaflets entire to pinnately lobed, the lobes crowded, obtuse, 1-4 mm. long, 0.5-1 mm. broad; petioles 2-9 cm. long; peduncles greatly exceeding the leaves; involucre wanting; bractlets of the involucel linear, acute, scarious with a prominent mid-vein, occasionally purplish-tinged, more or less confluent at the base, about equaling the flowers; umbels subcompact, the fertile rays 3-5, 1-17 mm. long; pedicels 2-4 mm. long; flowers white; fruit ovoid-oblong, 3-6 mm. long, 3-6 mm. broad, the wings oblong-linear to subdeltoid, narrower than the body, the dorsal wings 3, similar to the lateral; oil-tubes 1-7 in the intervals, 4-8 on the commissure; seed-face concave; strengthening cells absent.
Type locality: "Rocky Mountains south of Virginia City," Montana, Hayden 14.
Distribution: Western Montana and adjacent Idaho to Oregon, northeastern Nevada, and

Cymopterus humboldtensis M. E. Jones, Contr W. Bot. 12: 21. 1908.
Pseudocymopterus humboldtensis Mathias, Ann. Mo. Bot. Gard. 17: 325. 1930.
Plants acaulescent, 4-10 cm. high, cespitose from a long slender taproot, glabrous; leaves narrowly oblong in general outline, excluding the petioles 1-2.5 cm. long, about 1 cm. broad, bipinnate, gray-green, the leaflets entire to pinnately lobed, the lobes linear, obtuse, 1-2 mm. long, about 1 mm. broad; petioles less than 1 cm. long; peduncles exceeding the leaves, 2-7 cm. long; involucre wanting; involucel of linear, acute, sometimes purplish-tinged bractlets (occasionally appearing as bracts through shortening of the rays) ; umbels compact, the fertile rays 2-4, less than 5 mm. long; pedicels 0.5-2 mm. long; fruit oblong, 4-6 mm. long, 3-4 mm. broad, the wings linear, narrower than the body, the dorsal wings 3, similar to the lateral; oil-tubes 5-6 in the intervals, about 10 on the commissure; seedface slightly concave.
Type locality: "Above Clover Valley, East Humboldt Mountains," Nevada, about 11,000 feet, M. E. Jones.
Distribution: Southern Idaho and northeastern Nevada (Davis 188, Rollins & Chambers 2481)

Cymopterus nivalis là một loài thực vật có hoa trong họ Hoa tán. Loài này được S.Watson mô tả khoa học đầu tiên năm 1871.