Creek, Chisos Mts., June 25, 1937, B. H. Warnock 658 (Herb. Sul 
Ross State Teachers College; U.S. Nat. Herb.); Brewster Co., under 
Quercus, Oak Canyon, alt. 1870 m., July 5, 1931, J.4.Moore & J. A. 
Steyermark 3391 (Herb. Mo. Bot. Gard.): Brewster Co., Fern Can- 
yon, Alpine, July 7, 1925, Mr. & Mrs. W. W. Wimberley (Herb. 
Cornell Univ.); Jeff Davis Co., Fern Canyon, July 24, 1938, O. EF. 
Sperry T507 (Herb. Sul Ross State Teachers College). 
It is interesting to note that the genus Heevalectris has 
had a remarkable increase in number of species during 
the last two years. Prior to October, 1940, only two spe- 
cles were known, Hi. spicata (Walt.) Bernh. and HZ. 
mexicana Greenm. In June, 1941 (Correll in Bot. Mus. 
Leafl. Harv. Univ. 10, p. 20), a key was published for 
the identification of the five species then known. 
Xylobium concavum (Lind/.) Hemsley in Godman 
and Salvin Biol. Centr.-Am. Bot. 8 (1883) 252. 
Maavillaria concava Lindley in Bot. Reg. 80 (1844) 
Mise. p. 4. 
Maaitllaria stachyobiorum Reichenbach filius in Bot. 
Zeit. 10 (1852) 735. 
Nylobium stachyobiorum Hemsley in Godman and Sal- 
vin Biol. Centr.-Am. Bot. 8 (1888) 252. 
In describing Maaillaria concava, Lindley wrote: ‘*At 
first sight this species might be mistaken for JZ. bractes- 
COUN eee 
Later, Reichenbach wrote concerning his Maaillaria 
stachyobiorum: **Die Art selbst niichst JZ. bractescens 
Lindl.”’ 
A comparison of an analytical drawing in the Ames 
Herbarium of a specimen of JZ. stachyobiorum in the 
Reichenbach Herbarium with a drawing of the lip of J. 
concaca taken from a specimen in the Lindley Herbarium 
shows that they are essentially the same. The lip of JZ. 
stachyohiorum is shown as somewhat narrower than that 
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