52 FLORA. 



about 20-ribbed, about 3 mm. long, and 1 mm. in diameter, truncate at both ends, 

 the ribs Bhowing very clearly on the pericarp. In bays, streams, and ditches along 

 the Atlantic Coast rrom Greenland to Fla., and on the Pacific from Alaska to CaL 

 Also on the coasts "1 Europe and Asia. Summer. 



Family 2. SCHEUCHZERlACEAE Agardh.* 



Arrow-grass Family. 



Marsh herbs with rush-like leaves and small spicate or racemose per- 

 fect flowers. Perianth 4-6 parted, its segments in two series, persistent or 

 deciduous. Stamens 3-6. Filaments very short or elongated. Anthers 

 mostly 2-celled and extrorse. Carpels 3-6, 1-2-ovuled, more or less 

 united until maturity, dehiscent or indehiscent. Seeds anatropous. 

 Embryo straight. Four genera and about 10 species of wide geographic 

 distribution. 



Leaves all basal ; flowers numerous on naked scapes, spicate or in spike-like racemes. 



1. Triglochin. 

 Stem leafy; flowers few in a loose raceme. 2. Scheuchzeria. 



1. TRIGLOCHIN L. 



Marsh herbs with basal half-rounded ligulate leaves with membranous sheaths. 

 Flowers in terminal spikes or racemes on long naked scapes. Perianth-segments 

 3 6, concave, the 3 inner ones inserted higher up than the outer. Stamens 3-6 ; 

 anthers 2-celled, sessile or nearly so, inserted at the base of the perianth-segments 

 and attached by their backs. Ovaries 3-6, 1 -celled, sometimes abortive ; ovules 

 solitary, basal, erect, anatropous. Style short or none. Stigmas as many as the 

 ovaries, plumose. Fruit of 3-6 cylindraceous oblong or obovoid carpels, which 

 are distinct or connate, coriaceous, costate, when ripe separating from the base 

 upward from a persistent central axis, their tips straight or recurved, dehiscing by 

 a ventral suture. Seeds erect, cylindraceous or ovoid-oblong, compressed or an- 

 gular. [Greek, in allusion to the three-pointed fruit of some specfes.] About 9 

 species, natives of the temperate and subarctic zones of both hemispheres. Only 

 the following are known to occur in N. Am. : 



Carpels 3. 



Fruit linear or clavate, tapering to a subulate base. 1. T. palustris. 



Fruit nearly globose. 2. T. striata. 



Carpels 6; fruit oblong or ovoid, obtuse at the base. 3. T. maritima. 



i. Triglochin palustris L. Marsh Arrow-grass. (I. F. f. 184.) Root- 

 stock short, oblique, with slender fugacious stolons. Leaves linear, shorter than 

 the -capes, 12-30 cm. long, tapering to a sharp tip ; ligule very short ; scapes 1 or 

 2, slender, striate, o.2-0.6m. high; racemes 12-30 cm. long; pedicels capillary, in 

 fruit erect-appressed and 5-7 mm. long ; perianth-segments 6, greenish-yellow ; 

 anthers 6, sessile; pistil of 3 united carpels, 3-celled, 3-ovuled ; stigmas sessile; 

 fruit 6-7 mm. long, linear or clavate; ripe carpels separating from the axis and 

 hanging suspended from its apex, the axis 3-winged. In bogs, N. B. to Alaska, 

 south to N. Y., Ind. and Mont. Also in Europe and Asia. July-Sept. 



2. Triglochin striata R. & P. Three-ribbed Arrow-grass. (I. F. f. 185.) 

 RjOOtstocks upright or oblique. Scapes I or 2, more or less angular, usually not 

 over 0.3 m. high; leaves slender, slightly fleshy, nearly or quite as long as the 

 scapes, 0.5-2 mm. wide; flowers very small, light yellow or greenish, in narrow 

 racemes; pedicels 1-2 mm. long, not elongating in fruit; perianth-segments 3, 

 stamens .}; anthers oval, large; pistil of 3 united carpels; fruit subglobose or 

 somewhat obovoid, about 2 mm. in diameter, appearing 3-Winged when dry by the 

 contracting of the carpels; carpels coriaceous, rounded and 3-ribbed on the back; 



• Contributed by the late Rev. Thomas Morong, 



