ARROW-GRASS FAMILY 



97 



3. Triglochin maritima L. 

 Seaside Arrow-grass. Fig. 204. 



Triylochin viaritima L. Sp. PI. 339. 1753. 

 Triglochin data Nutt. Gen. 1: 237. 1818. 

 Triglochin maritima dcbilis M. E. Jones, Proc. Calif. .Acad. 



II. 5: 72i. 1895. 

 Triglochin concinna Davy, Erythea 3: 117. 1895. 



Rootstock without stolons, often subligneoiis, the 

 caudex thick, mostly covered with the sheaths of 

 Did leaves. Scape stout, nearly terete. 1-7 dm. 

 high; leaves half-cylindric, usually about 2 mm. 

 vvide ; raceme elongate, often 4 dm. long or more ; 

 pedicels decurrent, 2-3 mm. long, slightly longer in 

 fruit ; perianth-segments 6, each subtending a large 

 sessile anther ; pistil of 6 united carpels ; fruit ob- 

 long or ovoid. 5-6 mm. long. 2-4 mm. thick, obtuse 

 at the base, with 6 recurved tips at the summit ; 

 carpels 3-angled, flat or slightly grooved on the 

 back, or the dorsal edges curved upward and 

 winged, separating at maturity from the hexagonal 

 axis. 



In saline marshes along the coast and in interior regions, 

 Boreal and Austral Zones; widely distributed over the 

 northern hemisphere. On the Pacific Coast it ranges from 

 Alaska to Lower California. Type locality: Europe. A 

 slender form with more open racemes has been recognized 

 as distinct; the last two synonyms refer to it. 



2. SCHEUCHZERIA L. Sp. PI. 338. 1753. 



Rush-like bog perennials with creeping rootstocks, and erect leafy stems, the leaves 

 elongate, half-rounded below and flat above, striate, furnished with a pore at the apex and a 

 membranous ligulate sheath at the base. Flowers small, racemose, bracted. Perianth 6- 

 parted, regularly 2-serial, persistent. Stamens 6, inserted at the base of the perianth-seg- 

 ments; filaments elongate; anthers linear, basifixed, extrorse. Ovaries 3 or rarely 4-6, distinct 

 or connate at the base, 1-celled, each cell with 1-3 collateral ovules. Stigmas sessile, papillose 

 or slightly fimbriate. Carpels divergent, inflated, coriaceous, 1- or 2-seeded, follicle-like, 

 laterally dehiscent. Seeds straight or slightly curved, without endosperm. (Name in honor 

 of Johann Jacob Scheuchzer, 1672-1733, Swiss scientist.) 

 A monotypic genus of the north temperate zone. 



S^ 



1. Scheuchzeria palustris L. 

 Scheuchzeria. Fig. 205. 



Schcuchscria palustris L. Sp. PI. 338. 1753. 



Leaves 10-40 cm. long, the upper ones reduced to 

 bracts ; stems solitary or several, usually clothed at the 

 base with the remains of the old leaves, 10-40 cm. high ; 

 sheaths of the basal leaves often 10 cm. long with a 

 ligule 12 mm. long ; pedicels spreading in fruit ; flowers 

 wliite, few in a lax raceme ; perianth-segments oblong, 

 meiribranaceous, 1-nerved, 3 mm. long, the inner ones 

 narrower ; lower fruiting pedicels 5-25 mm. long ; fol- 

 licles 4-8 mm. long, slightly if at all united at base ; 

 seeds oval, brown, with a very hard coat. 



Growing in sphagnum bogs and on wet shores, Boreal Zones; 

 widely distributed over the cooler regions of the northern hemi- 

 sphere. On the Pacific Coast it ranges from Alaska to Sierra 

 County, California, but is infrequent. Type locality: Lapland. 



Family 8. ALISMACEAE. 

 Water-plantain Family. 



Aquatic or marsh plants, wath scapose stems and basal long-petioled sheathing 

 leaves. Inflorescence racemose or paniculate. Flowers regular, perfect, monoe- 

 cious or dioecious, pediceled, the pedicels in whorls and subtended by bracts. Peri- 

 anth-segments 6, the outer three small, herbaceous, persistent ; the inner three larger 

 and petaloid, decidtious. Stamens 6 or more ; anthers 2-celled, extrorse or dehiscing 

 by lateral slits. Ovaries numerous, distinct, on a flat or convex receptacle. 1-celled, 

 1-ovuled. Carpels becoming achenes in fruit. 



A family of about 13 genera and 50 species, of wide distribution in fresh-water swamps and streams. 



