Angelica ampla A. Nels.

Angelica ampla A. Nelson, Bull. Torrey Club 25: 375. 1898
Stout, 15-25 dm. high, the foliage glabrous, the inflorescence glabrous to sparingly puberulent; leaves deltoid in general outline, excluding the petioles 15-35 cm. long, ternate-pinnately divided, the leaflets ovate to ovate-lanceolate, acute to acuminate, sessile, crowded, 3-20 cm. long, 2-10 cm. broad, serrate; petioles stout, 1-4 dm. long, sheathing at the base; cauline leaves similar but greatly reduced above with conspicuously dilated and often bladeless sheaths, the uppermost petioles wholly sheathing; peduncles stout, 2-18 cm. long; involucre wanting; involucel of a few filiform bractlets, 3-6 mm. long; rays numerous, 30-45, spreading, subequal, 4—10 cm. long; pedicels 5-12 mm. long, spreading; flowers white, the petals obovate, glabrous; ovaries glabrous; stylopodium low-conic; fruit oblong-oval, 7-8 mm. long, 4-5 mm. broad, glabrous, the ribs about equally narrowly winged, narrower than the body, the wings thin; oiltubes small, continuous about the seed; seed-face concave.
Type locality: Sand Creek, Wyoming, near the Colorado line, A. Nelson 2046. Distribution: Rocky Mountains, Wyoming and Colorado (Macbride 2607c, Nelson 8807).

Angelica ampla là một loài thực vật có hoa trong họ Hoa tán. Loài này được A.Nelson mô tả khoa học đầu tiên năm 1898.