264 Engelmann and Gray, Plantce Lindheimeriana. 



clayey bottom of clear rivulets, in the prairies between the 

 Brazos and Colorado. July, and the whole year round. 1 



* m * No. 151. Monarda Lindheimeri of this enumeration 

 must be the same as M. scabra, Beck, in Sill. Jour. X. p. 

 260, which name should therefore be adopted. 



1 In addition to the enumeration of the North American Chara, published in 

 Silliman's Journal, Vol. XLVI. p. 92, (January, 1844,) we record the following 

 notices, communicated by Professor Braun : 



Mr. Lindheimer has sent from Texas specimens of Chara fiexilis, Linn. ? (incom- 

 plete specimen,) and of Ch. lenuissima, Desv. This last, as well as the specimens 

 from Massachusetts, may be distinguished as var. Americana ; the whorls are less 

 densely glomerate, but more approximate than in the European form. 



Chara polyphylla, A. Br., is a very polymorphous plant, occurring in many differ- 

 ent forms in America, Asia, and the Sandwich Islands. Professor Braun distin- 

 guishes seven subspecies. 



a. Ch. polyphylla Michauxii (Ch. polyphylla, A. Br. in Regensb. Bot. Zeit. 

 1835, p. 70; Ch. Michauxii, A. Br. in Sillim. Journ. 1. c. No. 11 ; Ch. capillata, 

 Michaux in herb. Jussieu ; Ch. hailensis, Turpin, Diet. sc. nat. Atlas.) Ohio, 

 (Michaux, Dr. Frank) ; Missouri, (Dr. Engelmann) ; Texas, (Mr. Lindheimer) ; 

 Hayti, (Turpin, 1796.) This is the stoutest, and also the most northern of all 

 species and subspecies of the remarkable group of Gymnopodce, A. Br. There are 

 five species now known, belonging to this group; and of these Ch. polyphylla is the 

 most polymorphous, and widest spread species. — The Gymnopodae are distin- 

 guished by having the lowest (often very short) joint of the otherwise coated leaves 

 (commonly called verticillated branchlets) naked, or destitute of the coating. 



b. Ch. polyphylla guadeloupcnsis, (Ch. indica, Bert.) Guadeloupe, Bertero. More 

 slender, with smaller, more elongated seed vessels (sporangia) and still shorter bracts. 



c. Ch. polyphylla ceylanica, (Ch. zeylanica, Klein in Willd.) Ceylon, Pondi- 

 cherry, Madras, etc. 



d. Ch. polyphylla javanica. 



e. Ch. polyphylla Muhlenbcrgii, (Ch. foliosa, Muhlenb. in Willd. ; Sillim. Journ. 

 1. c, p. 93, No. 10.) Pennsylvania, Muhlenberg. Very near subspecies C. ceylan- 

 ica, and distinguished from a. Michauxii, by the bracts being much longer than the 

 sporangia, while they are shorter in Michauxii. 



f. Ch. polyphylla Humboldtiana, (Ch. compressa, H. B. K.) New Andalusia, 

 Humboldt. A variety with some of the upper joints of the leaves destitute of the 

 coating. 



g. Ch. polyphylla armata, (Ch. armata, Meyen, Rcisebesch.) Sandwich Islands 

 Meyen. Distinguished by the stronger spines, and also mostly naked upper joints 

 and smaller seed vessels. 



A second species, distinct from Ch. polyphylla, but also belonging to Gymnopodce, 

 has been collected by Dr. Engelmann, in lakes in the bottom lands of the Missis- 

 sippi, near Saint Louis ; it is called by Professor Braun 



Ch. sejuncta, a more slender and greener plant than the last, but principally dis- 

 tinguished by the seed vessels (sporangia) and globules (often called anthers) being 

 always found on different joints of the leaves (or branchlets,) never as in most other 

 species, together on the same joint. — Martius has collected the same species in 

 Brazil ; the North American form is larger, and more slender, aud has bracts shorter 

 than the seeds; and may therefore be called var. brcvibradcata, and the Brazilian 

 variety, longibractcala. 



