72 JUNCACEAE. 



III. MARGINATI. 



Plants erect : inflorescence commonly 5-15, usually 5-10- 



flowered. 7. ./. tnarginatus. 



IV. ARTICULATI. 



Plants with globose heads : sepals shorter than the 



petals : capsules subulate. 8. J. nodosus. 



V. ACUMINATI. 

 Capsules subulate. 9. J. scirpoidcs. 



Capsules oblong to ovoid. 



Seeds tapering at both ends and caudate. 



Petals less than 3 mm. long : heads 2-7-flowered : 



capsule usually much longer than the petals. 10. J. hrachycephalus. 



Petals 3 mm. long or more : heads many-flowered : 



capsule about as long as the petals. 11. J. canadensis. 



Seeds abruptly narrowed at both ends and merely 

 apiculate. 

 Sepals and petals 2.5-3.5 mm. long : capsule ovoid- 

 lanceolate in outline, broadly acute and mucro- 



nate, about as long as the perianth. 12. J. acuminatus. 



Sepals and petals 2-2.5 mm. long : capsule linear- 

 lanceolate in outline, obtuse and merely apiculate, 

 exceeding the perianth. 13. J. dehills. 



1. J. effusus L. Scapes 5-12 dm. tall, striate near the top: leaf -blades obsolete, 

 or mere acicular rudiments: inflorescence open: flowers perfect: mature peri- 

 anth 2.5-3 mm. long: sepals and petals lanceolate: capsules obovoid, readily 

 dehiscent, rounded at the apex. — Common, in swamps. 



2. J. balticus Willd. Scapes 2-11 dm. tall: leaves mere bladeless sheaths: 

 panicle mostly narrow : flowers perfect : sepals lanceolate, 3^ mm. long : petals 

 similar to the sepals but slightly shorter: capsules 3.5-4 mm. long, about equal- 

 ling the sepals, beaked. — M. Bare, in the Dillerville swamp. — Limestones. 



3. J. bufonius L. Stems mostly less than 2 dm. tall: leaf -blades flat, or invo- 

 lute on small plants: panicle difi'use: sepals oblong-lanceolate, 4-6 mm. long, 

 acuminate: petals linear-oblong, obtuse, shorter than the sepals: stamens less 

 than i as long as the perianth: capsules oblong. — Rather rare, on roadsides. 



4. J. secimdus Beauv. Scapes 1-4 dm. tall: flowers permanently approximate: 

 sepals becoming 3.5 mm. long: petals green, longer than the sepals, about as 

 long as the capsule. — S. Eare, in swamps and on muddy banks. — Schists. 



5. J. tenuis Willd. Scapes 2-9 dm. tall: auricles of the leaf -sheath scarious: 

 sepals lanceolate, 3-4 mm. long, acuminate: petals slightly broader than the 

 sepals, much longer than the ovoid or obovoid capsule: anthers much shorter 

 than the filaments. — Common, in swamps and low grounds. 



6. J. Dudleyi Wiegand. Scapes 3-10 dm. tall: auricles of the leaf -sheaths 

 cartilaginous: sepals 4-5 mm. long, lanceolate, becoming very firm: petals 

 shorter than the sepals, acuminate, slightly longer than the oval capsule: sta- 

 mens 6; anthers shorter than the filaments. — N. Eare, on hillsides near Mt. 

 Hope. — Sandstones and sJiales. 



7. J. marginatus Eostk. Stems 1.5-5 dm. tall, somewhat bulbous at the base: 

 blades of the basal leaves 1-3 mm. wide: heads relatively large, commonly 5-15 

 together: sepals ovate to ovate-lanceolate, 2.5-3 mm. long, acute: petals obovate 

 or oblong-obovate, obtuse, slightly longer than the sepals, slightly longer than 

 the obovoid capsule: stamens 3. — S. Eare, in moist grounds. — Schists. 



8. J. nodosus L. Stems 1-6 dm. tall, borne singly on the rootstock: cauline 

 leaves 2-4; blades slender, conspicuously septate: sepals lanceolate-subulate, 

 3-3.5 mm. long: petals longer than the sepals, acuminate: capsules manifestly 

 surpassing the perianth, short-beaked. — M. Eare, in the Dillerville swamp. — 

 Limestones. 



9. J. scirpoides Lam. Stems 2-7 dm. tall: leaf -blades terete, 2-3 mm. thick, 

 the septa complete: sepals subulate-lanceolate, 2.5-3.5 mm. long: petals slightly 



