Genus 4. 



WATER PLANTAIN FAMILY. 



1. Lophotocarpus calyoinus (Engelm.) J. G. 

 Smith. Large Lophotocarpus. Fig. 227. 



Sagittaria calycina Engelm. in Torr. Bot. Mex. Bound 



Surv. 212. 1859. 

 Lophiocarpus calycinus Micheli, in DC. Monogr. Phan. 3 : 



61. 1881. 

 Lophotocarpus calycinus (Engelm.) J. G. Smith, Mem. 



Torrey Club 5: 25. 1894. 

 Lophotocarpus calycinus maximus Robinson in A. Gray, 



Man. Ed. 7, 84. 1908. 



• Plants mostly emersed; leaves i°-2° tall, the petioles 

 stout, the blades sagittate, hastate or lunate, 2i'-i2' 

 long, the basal lobes usually longer than the broad 

 terminal lobe, usually caudate-acuminate; scapes shorter 

 than the leaves, the inflorescence usually simple, with 

 2-7 whorls ; sepals suborbicular to orbicular-reniforrn, 

 becoming 4i"~7i" long; fruiting pedicels very thick, 

 usually elongate, mostly il"-2" long; fruit-heads si"-8" 

 in diameter; achenes broadly cuneate, i"-li" long, the 

 beak stout, the dorsal wing thin. 



In swamps. South Dakota to Delaware, Alabama, Texas 

 and New Mexico. July-Sept. 



2. Lophotocarpus depauperatus J. G. 



Smith. Small Lophotocarpus. Fig. 228. 



Lophotocarpus depauperatus J. G. Smith, Rep. Mo. 

 Bot. Gard. 11 : 148. 1890. 



Plants mostly emersed; leaves i°-i° tall, the 

 petioles relatively slender, the blades oWong, ellip- 

 tic, sagittate or hastate, i'-ij' long, including the 

 basal lobes which are usually more or less spread- 

 ing; scapes about one-half as long as the leaves, 

 mostly with 1 or 2 whorls ; sepals suborbicular, 

 becoming 3"-3$" long; fruit-bearing pedicels 

 rather stout, i'-ii' long; fruit-heads 3V-4" in 

 diameter; achenes cuneate, fully 1" long, or rarely 

 shorter, the beak slender, the dorsal wing thin. 



On margins of ponds, Wisconsin to Illinois, Mis- 

 souri and Oklahoma. June-Sept. 



3. Lophotocarpus spongiosus ( Engelm. ) 

 J..G Smith. Spongy Lophotocarpus: 

 Fig. 229. 



Sagittaria calycina spongiosa Engelm. in A. Gray, 



Man. Ed. 5, 493. 1867. 

 Lophotocarpus spongiosus (Engelm.) J. G. Smith, 



Rep., Mo. Bot. 'Gard. 11 : 148. 1899. 



Plants submerged; leaves J°-f° tall, the 

 petioles" stout and spongy, conspicuously no- 

 dose-septate, the blades spatulate, oblong, ellip- 

 tic, sagittate or hastate, i'-ii' long, the basal 

 lobes, when present, more or less falcate; 

 scapes about one-half as long as the leaves or ; , 

 less, the inflorescence simple, with one or two 

 whorls; sepals broadly ovate or orbicular-ovate, ; 

 becoming $"-6" long; fruiting pedicels very 

 stout, i'-l' long, or rarely longer; fruit-heads 

 3$"-5 in diameter; achenes cuneate, l"-lj" 

 long, the beak short, at the top of the achene- 

 body, the dorsal wing thin. 



On margins of brackish ponds and tide-water 

 marshes, New Brunswick to Virginia. July-Aug. 



