JUNCACEAE (RUSH FAMILY) 



277 



696. .1. diffusissimus. 

 Part of inflorescence x %. 



597. J. robust us. 

 Part of inflorescence 



Seed x 80. 



linear-subulate sepals and petals subequal ; capsule linear- 

 prismatic. Ind. to Ga. and Tex. June, July. FIG. 696. 



38. J. robustus (Engelm.) Coville. Stem stout, tall 

 (0.5-1.2 m.), bearing 2 or 3 long 



erect distinctly septate leaves, numer- 

 ous 6-8-flowered light brown beads 

 in a large much branched cyme (1-3 

 dm. long) ; ovoid-prismatic capsules 

 scarcely longer than the sepals ; seeds 

 fusiform-ovoid. (J. acuminatus, var. 

 Kngelin.) Deep swamps, 111. to La. 

 and Tex. June, July. FIG. 597. 



39. J. alpinus Vill. Stem erect 

 or slightly decumbent (0.5-3.5 dm. 

 high), from a creeping rootstock, with 

 1 or 2 slender erect leaves ; cyme 

 meager (1-15 cm. long), with erect 



branches bearing distant dark-brown heads, each of 3-10 



flowers (2-2.5 mm. long) and usually with one or more 



flowers elevated on slender pedicels ; sepals oblong, obtuse, 

 mucronate or cuspidate and usually longer than the rounded 

 oblong petals, as long as or shorter than the obtuse short- 

 pointed incompletely 3-celled castaneous capsule ; anthers as 

 long as the filaments ; style short ; seeds (0.6 mm. in length) 

 spindle-shaped. Wet shores and marshes, Arctic Am., s. to 

 Nfd., N. B., n. Me., n. Vt., Oneida Co., N. Y. (Haberer), 

 and L. Superior. July, Aug. (Eurasia.) FIG. 598. 



Var. insignis Fries. Similar, usually taller (sometimes 

 6 dm. high) ; the flowers greenish or straw-color ; the capsule 

 pale brown. (J. Richardsonianus Schultes.) Sandy shores, 

 etc., e. Que. to B. C., s. to 

 centr. Me., Pa., O., Ind., 

 111., etc. (Eurasia.) 



Var. fuscescens Fer- 

 nald. Branches spreading- 

 ascending ; glomerules com- 

 pactly and regularly flow- 

 ered, only exceptionally 

 with any of the greenish or 

 straw-colored flowers raised 



on elongate pedicels. Vt. to B. C. and Mo. 



40. J. articulatus L. Stems (1.5-6 dm. 

 high), tufted from a short creeping rootstock, 

 with 1-3 slender leaves; cyme short (2-9 cm. 

 long), spreading, the crowded heads 3-10- 

 flowered ; flowers brown (2.5-3 mm. long) ; 

 petals a little longer than the sepals, shorter 

 than the slender-conic incompletely 3-celled 

 deep chestnut-brown shiningcapsule ; anthers 

 as long as the filaments ; ovary attenuate into 

 a short style ; seeds (0.5 mm. long) obovoid, 

 attenuate below, abruptly pointed above. 

 Wet grounds. Nfd. to N. J., Out., and Mich. 



Var. obtusatus Engelm. Inflorescence pale, usually larger (sometimes 1.5 

 dm. long), the green flowers smaller, the abruptly mucronate pale capsule 

 shorter and duller. Me. to N. J. and Vt., oftenest in brackish soil. 



* * * Leaves flat and grass-like or filiform, not septate. 



41. J. stygius L. Stems (1-3 dm. high) from slender branching rootstocks, 

 1-3-leaved below, naked above, the leaves filiform ; heads 1-4, of 1-4 flowers, 



598. J. alpinus. 

 Inflorescence x %. 

 Fruiting flower x 3. 



J. articulatus. 

 Inflorescence x %. Fruiting flower x 8. 



July, Aug. (Eurasia.) FIG. 599. 



