204 



JUNCACE.E. Juncus. 



♦ ♦ Panicle or head terminal on the naked or leafy stem : leaves flat, 



channelled, or semitciete, not knotted. 

 Low annuals, with lihrous roots : stems leafy, branched. 



StamensG : capside oblong : branching from the base : flowers remote. 11. J. BUFONius. 

 Stamens 3 : cajisule ovate, njiiculate. 



Stem very shoi t with several scape-like peduncles : floweis in a 



small liead. !-• J- tuiformis. 



Stem very sliort and very much branched : peduncles l-2-tl()wered. 13. J. Ki;i,i,oo(;ii. 

 Taller perennials : stems simple : stamens (i. 



Stems naked : flowers solitary in a ditl'use (rarely compact) cyme. 14. J. tenuis. 

 Stems leafy : leaves flat and grass- like (not e(piitant): flowers capi- 

 tate or clustered. 

 Stem low, mostly equalling the leaves : ligules none : heads soli- 

 tary or few. 

 Spathes short : ])erianth equalling the capsule. 15. J. falcatits. 



Spathes elongaled : jperiantli .shorter than the capsule. 17. J. oinu.sATli.s. 



Stem taller, exceeding the leaves : ligules present : lu-ads 5 to 0. 10. J. longi.stvlis. 



» • « Stems leafy : leaves terete or laterally flattened, knotted trans- 

 versely : inflorescence terminal : flowers capitate. 

 Leaves terete or subcompressed. 



Stamens 3 ; anthers shorter than the filaments : heads few. 



Dwarf : early leaves caiiillary and floating : heads few-flowered. 18. .1. .si'PINIFOKMIs. 

 Tall : ligules conspicuous : heads many-flowered. 19. J. Hulanueki. 



Stamens 6. 



Stout : capsule narrow, acuminate. 



Leaves divergent : heads few, very many-flowered : anthers 



shorter than the filaments. 20. J. nodosus. 



Heads numerous in a compound panicle : anthers longer than 



the filaments. 21. J. i)Uiiiu.s. 



Slender : capsule oblong, abruptly acute. 



Leaves very narrow : heads small, one to many : anthers longer 



than the filaments. 22. J. Nkvadensls. 



Leaves flattened and eipiitant. 



Stems stout, ancipital : leaves broader. 



Heads small, n\imerous in a compound panicle : perianth-scgment,s 

 linear-lanceolate : anthers exceeding the filaments : capsule 

 narrow, attenuate, exserted : ligules present. 23. J. oxvmekis. 



Heads usually many and larger : segments lanceolate : anthers 



short : capsule oblong, acute : ligules none. 24. J. xiniioinES. 



As the last ; anthers much longer : stigmas long-exserted. 25. J. I'II7Eocei'1IAI.u.s. 



Stems low, slender, compressed : leaves very narrow, with ligules. 



Heads 1 or 2 : perianth-segments pale and scarious, often ohtuse. 26. J. chi.ouocepiiai.u.s. 

 Head solitary, manv-llowered : segments very dark, naiiowly 



aanninate. " 27. J. Meutensianus. 



* Ste77is leafless and scape-like, from matted roofstocks, sheathed at base ; the 

 sheaths sometimes hearing terete leaves like the scape: Jlowers in sessile appar- 

 enthj lateral panicles. — Juncus proper. 



^- Flowers clustered, hexandrous : scapes stout, the inner sheaths leaf-hearing : 

 spathes usuallg shorter than the injhrcsvenre. 

 1. J. robustUS, Watson. Scape ami leaves 2 to 4 feet liigli or more, stout, 

 rigid and pungent : panicle compound with very unetpial brandies, usually 3 to (» 

 indies long, erect and strict, about equalling or exceeding tlie spatlie : secondary 

 spatlies and bracts long-acuminate, ecpialliiig or exceeding tlie Uowers : clusters 

 2_4-flo\vered : i)eriantli-segments scariously margined, tlie outer bn)ad]y lanceolate, 

 acute, the inner obovate and deeply emarginate, a line long, exceeding tlie stamens : 

 style nearly equalling the stigmas : capsule subglobose, narrower at base, rounded at 

 the summit, apicidate, brown, nearly 2 lines long : seeds acute at each end or sHglitly 

 caudate, about \ line long, very finely ribbed. — 1^-oc. Amer. Acad. xiv. 302. J. 

 aciitus, Engelm. 1. c. 138. J. acutiis, var. spha'rocarpiis, Kngdiu. in Wheeler's 

 Kep. vi. 37B. 



