NOMENCLATORIAL CHANGES IN SPECIES 
OF SPIRANTHES FOUND IN PERU 
BY 
CHARLES SCHWEINFURTH 
The following nomenclatorial changes have been found 
advisable in studying the Spiranthinae recorded from 
Peru. 
Spiranthes laxa ( Poepp. & Endl.) C. Schweinfurth 
comb. nov. 
Stenorrhynchus laxus (as Stenorrhynchos Jaxum) 
Poeppig & Endlicher Nov. Gen. ac Sp. 2 (1887) 7, t. 
109—Cogniaux in Mart. FI. Bras. 8, pt. 4 (1895) 172. 
Pelexia lawa Lindley Gen. & Sp. Orch. PI]. (1840) 482. 
Since it seems advisable, from the viewpoint of sim- 
plicity, to follow Bentham & Hooker f. in including the 
concept Stenorrhynchus in the older genus Spiranthes, 
a new combination must be made. 
Spiranthes Lechleri C. Schweinfurth comb. nov. 
Brachystele Lechleri Schlechter in Fedde Repert. Bei- 
hefte 9 (1921) 59—Schlechter ex Mansfeld in Fedde 
Repert Beihefte 57 (1929) t. 107, nr. 421. 
Since the genus Brachystele Schltr. is considered to 
be inseparable from the polymorphic Spiranthes, the con- 
cept B. Lechleri is herewith transferred to the latter 
genus. 
In some Peruvian collections (Macbride & Feather- 
stone 1224, 1589, 2273) which are referable to this spe- 
cies, there are often present clusters of very stout tuberoid 
roots; the height of the plant sometimes exceeds 4 dm. 
and at most the floral bracts only slightly exceed the 
flowers. Moreover, the flowers which are slightly larger 
than those of the type, are designated as bright to deep 
golden yellow, and the mid-lobe of the lip is commonly 
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