86 Alismaceae Scheuchzeria 



1. Triglochin maritima L. (Fernald. Some variations of Triglochin 

 maritima. Rhodora 5: 174-175. 1903.) Map 102. Infrequent in a few 

 counties in the lake area. It prefers calcareous soil and grows on the 

 marly borders of lakes and in springy places. I have seen it growing with 

 the next species in marl so strongly alkaline that only a few plants could 

 survive. In such a habitat it will usually be associated with EleocJuiris 

 pauciflora. - — 



Lab. to Alaska, southw. to N. J. and Mex. 



2. Triglochin palustris L. Map 103. Very local in marly springy areas 

 on marly shores of lakes in our northern counties and in a marly springy 

 place in Henry County. 



Greenland to s. Maine along the coast, and inland to the Great Lakes, 

 westw. to Colo, and Alaska ; found also in Eurasia. 



67. SCHEUCHZERIA L. 



1. Scheuchzeria palustris L. var. americana Fern. (Rhodora 25: 177-. 

 179. 1923.) Map 104. Very local in some of the counties of the lake area. 

 I have it only from two counties but it has been reported also from 

 Cass, Fulton, Lake, Marshall, Porter, and St. Joseph Counties. It is usually 

 found in sphagnum with pitcherplant and cranberry. 



Newf. to Hudson Bay and Alaska, southw. to N. J., Pa., Wis., and Calif. 



15. ALISMACEAE DC. Water-plantain Family . 



Flowers in a panicle, the branches bearing whorls of flowers in verticils of 3-10 flowers 

 each; flowers perfect; carpels in a single series, forming a ring on a small 



receptacle 70. Alisma, p. 86. 



Flowers in verticils; carpels in several series on a convex receptacle. 



Flowers in verticils of 3-9 or more, in plants of average vigor with some of the 

 verticils with more than 3 flowers; leaf blades large, cordate or subcordate at 



the base, usually with 5-7 primary veins; flowers all perfect 



75. Echinodorus, p. 87. 



Flowers mostly in verticils of 3, or 1 or 2 at a node; leaf blades sagittate or 



lanceolate, usually with more than 5-7 veins. 



Fruiting pedicels very thick, usually 2-5 cm long, at least the lowermost widely 



spreading or recurved; sepals mostly suborbicular, large, surrounding the 



mature fruit; lower verticils of flowers pistillate, the upper ones staminate; 



stamens 9-15 76. Lophotocarpus, p. 88. 



Fruiting pedicels not conspicuously thick, ascending; sepals not broad and sur- 

 rounding the fruit at maturity, usually reflexed; staminate flowers on 

 separate scapes or at the top of the scape above the pistillate ones; stamens 

 numerous 78. Sagittaria, p. 88. 



70. ALISMA L. Water-plantain 



Petals 1-2 mm long; anthers subspherical, 0.3-0.5 mm long; styles 0.2-0.3 mm long, 

 curved at the apex; achenes 1.5-2 (2.5) mm long 1. A. sub cord atum. 



Petals 3.5-6 mm long; anthers oblong, 0.6-0.9 mm long; styles 0.4-0.7 mm long, slightly 

 curved; achenes 2.5-3 mm long 2. A. Plantago-aquatica var. brevipes. 



1. Alisma subcordatum Raf. (Alisma Plantago-aqiiatica of Gray, Man., 

 ed. 7 and of Indiana authors, in part, not of L.) Map 105. Infrequent to 



