Spiranthes Pavonii Reichenbach filius in Bonpl. 4 
(1856) 211. 
Spiranthes matucanensis Krinzlin in Engler Bot. 
Jahrb. 54 (1916) Beibl. 117, p. 16. 
Spiranthes pachyrhiza Krinzlin in Engler Bot. Jahrb. 
54 (1916) Beibl. 117, p. 16. 
Pelexia matucanensis Schlechter in Beih. Bot. Cen- 
tralbl. 87 (1920) Abt. 2, p. 410. 
Sarcoglottis Pavoni Schlechter in Beih. Bot. Cen- 
tralbl. 37 (1920) Abt. 2, p. 419. 
Judging from the excellent description of Spiranthes 
Pavonii (l.c.), supplemented by analytical drawings of 
this concept from the Reichenbach Herbarium in Vienna, 
it is evident that we should include in this variable spe- 
cies the plants described as Spiranthes matucanensis and 
SS. pachyrhiza which were considered to be synonymous 
by Schlechter (in Beih. Bot. Centralbl. 37 (1920) Abt. 2, 
p. 410). 
The analytical drawing of Spiranthes Pavonii shows a 
short compact raceme (of somewhat immature flowers) 
which is almost an exact counterpart of the inflorescence 
of S. pachyrhiza as exemplified by the two isotypes ex- 
amined. iS. matucanensis is shown by a photograph of the 
type in the Ames Herbarium to have a rather loose and 
relatively elongate raceme due to the fact that the flow- 
ers appear to be somewhat advanced by reason of their 
swollen ovaries. It is interesting to note in this connec- 
tion that the spike of S. Pavoni is described as at first 
quaquaversal and then secund in anthesis. 
A further detail of similarity is that all of these con- 
cepts actually have petals with a subacute or abruptly 
acute apex, although in both S. matucanensis and S. 
pachyrhiza the petals were described as obtuse. 
Spiranthes Weberbaueri Kr dnzl. var. aurantiaca 
C. Schweinfurth var. nov. 
[7] 
