420305 Sagina nodosa (L.) Fenzl
- Fenzl, Vers. Darstell. Alsin.: t. ad 18 (1833). - Spergula nodosa L., Sp. Pl.: 440 (1753). Lectotype (LINN): Europe. Herb. Linn. 604.4 (Crow 1978: 25).
2n=
ca. 52 56 (8x, x = 7). - Europe (N, W), North America. - Several reports, probably only subsp. nodosa.
Not included: An old report of 2n = 20-24 from Germany (Wulff 1937).
Geography: North American (N) - amphi-Atlantic - European - Asian (W).
Notes: Crow (1978) recognized two subspecies of Sagina nodosa. Crow (2005) accepted both from North America and they were accepted from northwestern Europe after revision of the Nordic material by Karlsson and Nilsson (2001). Subspecies nodosa has rosette leaves and stems often erect, stems with glandular hairs, longer than in subsp. borealis, and inflorescences many-flowered with few or no bulbils. Subspecies borealis has rosette leaves and stems shorter and often prostrate or ascending, and stems glabrous and few-flowered but with numerous bulbils. Both subspecies occur in the southern parts of Fennoscandia but only subsp. borealis has been recorded from the arctic parts in Iceland, Norway, and European Russia. According to Crow (1978, 2005), subsp. nodosa is mainly European and has been introduced in North America, whereas subsp. borealis mainly is North American and Greenlandic and in northern Europe only found in the glaciated parts. Northern Siberian plants, e.g., along the Jenisei (S) and Lena rivers (2004, O), belong to subsp. borealis according to the characters emphasized by Crow. All arctic European and Asian records are therefore entered under this subspecies.
Subspecies nodosa does not reach the Arctic in Europe but has been reported to reach it as adventive in Canada at Hudson Bay. However, Crow (2005) excluded arctic occurrences.