HEXAND. MONOG. 



109 



partitions, which often, in a dry state, give a jointed appearance to 

 the leaves') . 



16. J. subveriicillatus (whorkd Rush], " cauline leaves subu- 

 late nodoso- articulate, panicle corymbose, heads of about 5 

 flowers fasciculate- verticillate, capsule obtuse as long as the 

 striated perianth.'* Bich. in Linn. Trans, v. 12. p. 322. 



HAB. Marshes N. of Glasg., G. Don. Fl. Aug. 11 . 



Of this, likewise, I know but little, having no authentic specimen. 

 There is a figure of the J. subverticillatusQi Willd. in Host's splen- 

 did Gram. Austr., but neither do Host or Willdenow speak of the 

 jointed leaves ; and the former considers it to be the J. uligin. of Sm. 



17. J. aculiflorus (sharp -flowered Rush), leaves nodoso-articii- 

 late subcompressed, panicle terminal very compound, leaves 

 of the perianth lanceolate nearly as long as the narrow ovate 

 subacuminate capsule. Lightf. p. 184? and E. B. t. 238 

 (J.articulatus}. Bich. in Linn. Trans, v. 12. p. 323. 



HAB. Bogs, very common, G. Don. Fl. July, Aug. I/ . 



One foot to two feet high, erect. Leaves 3 4 on a stem, very distinctly 



nodoso-articulate, when dry. Panicle diffuse, in fr. spreading. 



Flowers two or three together, greenish brown. General bracteas 



short, membranaceous, scarcely leafy. 



18. J. lampocarpus (shining -fruited Rush), "leaves compressed, 

 panicle terminal compound erect, 3 interior leaves of the pe- 

 rianth rather obtuse, capsule acute triquetrous shining," Bich. 

 E. B. t. 2143. Bich. in Linn. Trans, v. 12. p. 825. 



HAB. Bogs very common, G. Don. Fl. July, Aug. If. . 



" This plant in an advanced state is easily known from J. acutiflorus 

 and obtusifiorus by its large shining dark capsules". While early in 

 flower, the best marks are the more simple panicle and somewhat 

 obtuse cal." In my specimens from Mr. Bicheno, I find no differ- 

 ence between the perianth of this and the J. acutifl., and the shape 

 of the capsule is ovate and subacuminate. 



19. J. oliusifiorus (blunt -flowered Rnsh\ leaves rounded no- 

 doso-articulate, panicle very much compounded spreading, 

 leaflets of the perianth very obtuse as long as the capsule. 

 E. B. t. 2144. Bich. in Linn. Trans, v. 12. p. 327. 



HAB. Marshes near Forfar, rare, D. Don. Fl. Aug. If. . 



Whatever doubt may be entertained as to J. lampoc. being distinct 

 from J. acutifl.., there can be none about this. Its panicles are re- 

 markably compound and branched, and the leaflets of the perianth 

 are singularly obtuse and convex. My specimens do not possess 

 ripe capsules. Bicheno describes them as oval and mucronate. 

 Smith figures them as broadly obovate. All in this division have 

 3 longitudinal angles. 



20. ^.polycephalus (many - headed Rush), leaves subulate round- 

 ed articulate, panicle terminal erect di-trichotomous, branches 

 nearly simple, heads of many flowers lateral and terminal 

 nearly sessile, leaflets of the perianth lanceolate acute rather 



