| Author | (Sprengel) Magnus | |
| Distribution | Present over the lower half of the Coastal Plain, and widely scattered elsewhere in the state, but with just a single Mountain collection. For some odd reason, though there are numerous Piedmont collections, there seem to be none in the western half of the Coastal Plain, a presumed artifact of collection of such an aquatic species.
This is a very widespread species, from southern Canada throughout the US, in all states. Thus, the near absence of montane county records is somewhat odd.
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| Abundance | Fairly common in the lower Coastal Plain, and infrequent in the Piedmont. Rare (or absent?) in the western Coastal Plain and the mountains. | |
| Habitat | This submerged species grows only in still or sluggish waters -- pools, ponds, lakes, and slow-moving rivers and creeks. This species often grows in brackish water, unlike with N. gracillima. | |
| Phenology | Flowers and fruits from August to October. | |
| Identification | This submerged species has a branched stem, with "stringy" branches reaching up to 1.5 inches long -- producing a tangled mat of vegetation. The opposite leaves are linear, about 2/3-inch long but barely 1/10-inch wide. This species has the widened leaf bases gradually tapered, whereas N. gracillima has a wide leaf base that is truncate or squared-off. Though D. guadalupensis has 20 or more teeth on a leaf margin, these are microscopic and practically invisible. | |
| Taxonomic Comments | Weakley (2018) indicates that the nominate variety -- var. guadalupensis is the one present in NC.
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| Other Common Name(s) | Southern Naiad, Common Waternymph, Guppy Grass | |
| State Rank | S3 [S3S4] | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | OBL link |
| USACE-emp | OBL link |
