Protologue Description: Var. stenocarpus Fernald et Buchenau.- Planta gracilis; caules tenues, usque 50 cm alti, diam ca. 1 mm, medullâ indistincte asterisiciformi repleti;, serius cavi. Inflorescentia anthelata, pluri- (ca. 6- usque 15-)flora. Tepala aequilonga, acutata; stamina tepalis 1/3 breviora; antherae filamentis quadruplo longiores. Fructus lanceolatus, longius acuminatus, perigonium conspicue superans, tricularis; semina pallide ferruginea.
Angeschwemmte Inseln de Mündung das Bonaventuraflusses, Provinz Quebec (Collins, Fernald u. Pease; Aug. 1904).