Single Record

Species: Erigeron concinnus [Erigeron pumilus var concinnus] [Erigeron pumilus subsp. concinnoides] [Erigeron setulosus] [Distasis concinna]

PhotoRecords: YES Rich Haswell: Rio Grande Co, gravel pit 1.5 air miles NE of Del Norte 20 June 2021

Comments: For Erigeron concinnus there are only two Watershed herbarium voucher locations, both in Rio Grande Co: the foothills 3 miles S of Del Norte, and a hillside above Beaver Creek campground SW of South Fork. Another possible, not confirmed, collection is from Biedell Creek in Saguache Co. Photorecords confirm the Beaver Creek location in 2017 and add a gravel pit NE of Del Norte (2021) and the Trout Creek trailhead off Hwy 160 just SW of South Fork (2021). Possibly the species is more common and the many herbarium specimens from the Watershed that are labeled "E. pumilus" or "E. engelmannii" are E. concinnus (see Nesom 1983). The surest traits distinguishing E. concinnus are the hardened and inflated throat of the disk corollas, the short, broad outer scales of the pappus, and the yellowish or orangish center of the phyllaries. E. concinnus is recorded from all the New Mexico counties bordering Colorado, although it follows the Rio Grande drainage no farther south. Its USA distribution is the Rocky Mountains, the Intermountain region, and the desert Southwest. Note that Nesom (1983) agrees with Conquist (1947) that some specimens of E. concinnus have from "west-central" Colorado have "appressed or ascending stem pubescence," suggesting a hybridization with E. engelmannii. Whether this intermediate form of E. concinnus can be found in the Watershed remains to be seen.