3io 



SYSTEMATIC BOTANY. 



2. Juncus. Perianth persistent, 6-parted. Stamens 6, rarely 3. 

 Stigmas 3. Capsule 3-celled, loculicidal, many-seeded. 



1. J. EFFUSUS (Bog Rush}. Scape erect, soft and flexible, striate, sheathed 

 at base ; flowers in a sessile, very branching panicle, small, numerous, green- 

 ish ; sepals acute ; stamens mostly 3 ; capsule obtuse. In wet grounds, 2-3 

 feet high. June- July. 



2. J. ACUMINATUS (Bog Rusti). Stem erect, round ; leaves few, round 

 or nearly so ; flowers in many or few brownish, few-flowered heads, arranged 

 in a panicle ; sepals linear-lanceolate, very acute, much shorter than the acute, 

 triangular capsule. In bogs and along ponds, io'-i8' high. August. 



3. J. TENUIS (Slender Rush). Stem very slender, erect, leafless, except 

 at base ; leaves linear, setaceous, shorter than the stem ; flowers separate, 

 rarely sessile, in a loose, somewhat umbelled, cymose panicle, with unequal 

 branches ; sepals lanceolate, acuminate, longer than the ovoid-globose cap- 

 sule. 



4. J. BUFONIUS (Annual Rush}. Stem slender, leafy, often branching 

 at base ; leaves channeled, very narrowly linear ; flowers greenish, remote, 

 sessile, forming a spreading dichotomously branching panicle ; sepals lanceo- 

 late, much longer than the obtuse capsule. Along road-sides, 3 / -6 / high. 

 June- August. 



Order LXXXIX. PONTEDERIACE.E {Pickerel-weed 

 Family?) 



Aquatic herbs. Flowers solitary, or spicate, arising from a 

 spathe, or from a fissure in the petiole. Perianth tubular, 6-cleft, 

 persistent and withering, colored, often irregular. Stamens 3, 

 inserted on the throat of the perianth ; or 6, and variously at- 

 tached to the perianth. Ovary I -3-celled. Style i. Stigma i. 

 Capsule 3 valved, i or many-seeded. 



Pontederia. Perianth funnel-form, bilabiate, upper lip 3-parted ; 

 lower lip of 3 spreading divisions. Stamens 6, 3 inserted near the sum- 

 mit of the tube, and exsert ; 3 near the base (often imperfect) with very 

 short filaments. Ovary 3-celled, i-ovuled. if. 



P. CORDATA (Pickerel-weed). Stem thick and stout, erect ; leaves mostly 

 radical, cordate-sagittate, smooth and glossy green, petiolate ; flowers blue, 

 in a dense spike, with a bract-like spathe ; anthers blue. In shallow water, 

 To'-i8' above water. July. 



Order XC. CYPERACE^E (Sedge Family). 



Herbs, usually perennial, coarse, grassy, caespitose plants. 

 Culms usually solid, without joints or nodes, mostly triangular. 

 Leaves with entire sheaths, sometimes wanting. Flowers soli- 



