428 90. 



17. J. alpinus (Vill.) ; st. 2 3-leaved erect almost terete, l.-sheaths 

 with acute dorsal angle, pan. compound with nearly erect branches, per.- 

 segm. equal obtuse the outer 3 mucronate, fr. oblong-ovoid mucronate. 

 R. ix. 403. Resembling Sp. 16 but smaller and more slender, internal 

 transverse divisions of 1. less apparent, pan. -branches more erect and 

 slender, fl. fewer (2 5), per.-segm. broader with narrow scarious 

 margin, caps, shorter and blunter. Mountain bogs. P. VII. VIII. S. 



18. J. nigritel'lus (D. Don) 1 ; 3 4-leaved st. and internally 

 jointed /. nearly cylindrical, panicle slightly compound erect, 

 sheaths dorsally acute, per.-segm. nearly equal (3 inner rather 

 longer and broader) all acute falling short of the linear-oblong 

 trigonous beaked (black) capsule. E. B. S. 2643 (1830), not of 

 Koch. St. erect, (J 12 in. high. L. scarcely compressed. 

 Clusters of more fl. than in Sp. 1 6. Caps, brown, at length 

 black and glossy, more abruptly pointed than in J. lampro- 

 curnus. Boggy "places in the north, and Wells. Norf, P. 

 VII. VIII. E. S. I. 



19. J. bulbosus (L.) ; st. filiform, 1. setaceous slightly 

 channelled faintly jointed internally, panicle nearly simple 

 irregular long with lew distant clusters, per.-segm. equal acute 

 (3 inner rather blunt) nearly equalling the oblong very blunt 

 mucronate (pale brown) capsule, anth. as long as their filaments. 

 E. B. 801. R. ix. 397. J. supinus (Moench) ed. viii. 

 J. tdiginosus and J. subverticillatus Sin. Extremely variable in 

 size and the direction of its stems, sometimes erect, at others 

 prostrate and rooting at every joint, or \_J.fluitans (Lam.)] 

 floating. Fl. often viviparous. Stain. 3 or 6. j8. Kochii\ 

 caps, shorter, stam. 6, filaments nearly twice as long as the 

 elliptic anthers. J. nigritellus Koch (1887). St. 78. 2. 

 Boggy and wet places. $. Ivy Bridge, Devon (in a bog). 

 Connomara, Galway. P. VL VIII. E. S. I. 



ttt Flowers solitary, remote, or corymbose and forming a 

 terminal panicle. Seeds not appendaged. 



20. J. squarrdsus (L.) ; st. leafless simple, 1. linear channelled 

 radical, panicle terminal compound with cymose branches, per.- 

 segm. ovate-lanceolate acute or bluntish equalling the obovate 

 blunt mucronate capsule, anth. 4 times as long 1 as their filaments. 

 E. B. 933. St. 36. 11. R. ix. 400. St. erect, 61 2 in. high. 

 L. many, somewhat spreading, rigid, half as long as the stem. 

 Caps, pale brown, shining. AVet heaths and moors. P. VI. VII. 



E. S. I. 



Buchenau considers this an alpine form of Sp. 16. H. & J. G. 



