Page:Books from the Biodiversity Heritage Library (IA synopsisofbritis00hobk).pdf/37

 cuspidate; st. l. ovate acute, br. l. lanceolate acute præmorse slightly fringed and bordered; per. l. broadly ovate, acute, ped. short: dioicous.

Wet bogs.

17. P. Beauv. "Distinguished from the last by its branch leaves, recurved when dry, elliptical, not attenuated towards the apex; usually growing out of the water, whilst S. cuspidatum is almost submerged."—G. E. Hunt.

Common in bogs.

var. δ. laricinum. Spruce. l. loosely imbricated, slightly undulate when dry, areolæ very minute.

18. Schultz. St. 3-6in. rigid blackish, "with a single layer of cortical cellules", and with crowded generally contorted attenuated branches; leaves ovate-lanceolate, acute concave, frequently 3-toothed at the apex, the cellules bordered with a row of small pores at the back of the leaf: dioicous.

Bogs and ditches.

var. γ. obesum; stem more robust, branches thicker and longer, leaves larger.

19. Nees & H. Allied to contortum, but more lax in habit, stems more slender, with shorter branches and with the branch leaves generally more or less secund.

20. Wils. MS. Allied to the last; stem with a cortical layer of two or three rows of cellules, leaves without marginal pores, entire, acute.