\ 



212 



UNITED STATES AND MEXICAN BOUNDARY. 



Zannichellta palustris, Linn.; Kunth, Enum. 3, p. 124; Torr. I. c. p. 253. Slow-flowing 

 streams and stagnant waters, western Texas, Chihuahua, and Sonera. 



Fl 



PECTiNATUs, Linn.; Torr. Fl. Neio York, 2, p. 247. 

 Flowing water near San Diego, California ; Parry. 



marinum, Linn.\Michx 

 rucson, Sonora : ScTiott 



Wright.) 



PoTAMOGETON HYBRiDUS, Michx. Fl. 1, p. 101 ; ToTT. I. c. In Water on the prairies of the 

 Guadalupe river, Texas, May ; Wright. 



Fl 



Torr. I. c. 



Michx. Fl 



non Linn. Stagnant water of the Limpio, July ; Bigelow. 



PoTAMOGETON LUCENS, Linn.; Kunth, Enum. 3, p. 132 ; Torr 

 Texas, to the Eio Grande. 



PoTAMOGETON NUTANS^ Linn.; 

 Limpio^ Texas ; Bigelow. Ojo Caliente, Chihuahua ; Thurber. 

 E. K. Smith. 



e. p, 255. San Antonio, 



KuniTiy Enum. 3^ p. 127; Torr. I. c, », 253. Waters 



Capt 



ALISMACE^, by Dr. George Engelmann, 



/ 



Sagittaria simplex, Purshy Fl 2, p, 397 ; Groy^ Man. ed. 2, p. 439. In ponds, western 

 Texas ; Wright 



Sagittaria CALYCINA (Engelm. MSS): pedicellis fertilibus sterilia asquantibus; fructiferis re- 

 curvatis ; floribus omnibus hermaphroditis, fertilibus subdodecandris, sterilibus polyandris ovaria 

 pauca sterilia gerentibus ; filamentis subulatis Iseviusculis seu tenuiter papillosis antheram late 

 ovatam subsequantibus seu paullo superantibus ; stylo erecto ovario longiore in carpellis maturia 

 obovatis duplo longioribus horizontali ; sepalis orbiculatis carpellorum capitatum arete involven- 

 tibus. 



Var. a. maxima : foliis maximis sinu latissimo hastatis, lobis divaricatissirois tenuiter subulato- 

 appendiculatis ; scapo robusto ramoso ; bracteolis lanceolatis acutis ; verticillis fructiferis plu- 

 ribus capitulis inagnis. 



Dr. Hale 



Var, p. MEDIA : foliis minoribus sinu latissimo hastatis lobis divaricatis s, divaricatissimis 



solum (raro duobus) 



bracteis ova- 



minoribus 



En 



Var. T'. ELUITANS : foliis oblongo-linearibusfluitantibus; scapo debili verticillis ssepe 1-2-floris; 



obtusia : nedicellis elonsratis inequalibus: canitulis mi 



Ponds and slow-flowing 



waters, western Texas, Wright ^ No. 1899. Also in Missouri^ and in the Merrimac river, Massa- 

 chusetts ; Engelmann. 



[Dr. Bigelow collected near San Elceario, on the Rio Grande, a Sagittaria which was over^ 



r 



looked when Dr* Engelmann revised the genus in my herbarium in 1856. It seems to be the 

 same as a plant from western Texas, which Dr, E. named, provisionally, S. longiloha^ and which 

 he regarded as very near S. simplex. We can find no sufficient characters for distinguishing it 

 from that species. The leaves, however, are sagittate, with very long, narrow, and widely 

 diverging lobes, a state in which we have never seen S. simplex. J. T.] 



