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AGAVES OF THE UNITED STATES. 71 
1857, 158; Baker, Amaryllideae, 196; Terr. Monogr. 11; 
Engelm. Bot. Mex. Bound. (1858), 214. A. maculosa 
Engelm. Trans. St. Louis Acad. iii. 301, Coll. Writings, 
305. — Icones: Hook. Bot. Mag. ser. 3, xv. pl. 5122; 
Fenzi, Gard. Chron. 1872, 1194, fig. 273. — Southern 
Texas.— Plate 28. 
Represented by two forms, of like distribution, of which 
the more common has the perianth tube longer than the 
suberect segments which nearly conceal the anthers; the 
bracts are elongated, and the leaves long, robust and 
slightly denticulate. The other form, which is the variety 
brevituba of Engelmann, Trans. St. Louis Acad. iii. (1875) 
301, Coll. Writings, 305, has the tube about equal to the 
segments, which are frequently recurved. This exposes 
the longer anthers and filaments. The bracts are broader 
and shorter, and the leaves are short and narrow. 
This is an exceedingly variable species. I have placed 
in it all specimens of the Manfreda group in Southern 
Texas which have emarginate lobes to the stigma. I have 
followed Baker in employing for it Regel’s name, although 
the emargination of the stigma is not mentioned in the 
original description of A. maculata. The filaments are 
there described as being long-exserted, and the species is 
said by Regel to be related to A. rubescens, Salm-Dyck. 
In the figure of Hooker cited, the emargination of the 
stigmatic lobes is scarcely more than suggested, but in that 
of Fenzi, it corresponds well with the typical form of our 
species. I find a specimen in the Gray herbarium, collected 
by Dr. Palmer, with narrow strongly denticulate leaves ; 
flowers 85 mm. long, segments 10 to 12 mm. long, and 
filaments 15 to 25 mm. long. These filaments protrude 
beyond the segments. The stigmatic lobes are emarginate 
in some of the flowers. It is possible that collectors will 
find Regel’s plant, and perhaps transitions between the two, 
in Northern Mexico. Perhaps our plant may prove to be a 
variety of the other. 
Specimens examined:— Mier, amongst Mezquit trees, 
