MACLOSKIE I REVISION OF FLORA PATAGONICA. 97 



A. UNIFLORA Phil. 



S. Chili ; Valdivia ; central Patagonia, Chubut Territory near Lago 

 Fontana. 



Arachnites Pfitz. has the limb of leaf suddenly contracted to a petiole ; 

 sepals long, tailed. Pfitzer & Kraenzlin make it a section of Dendro- 

 chilmn; several species in the Orient; but no A. uniflora is named, and 

 no Dendrochilum uniflorum in their Orchidaceae. 



Fam. 21. ORCHIDACEAE. Macl., p. 320. 



In Engler und Prantl, Die natiirlichen Pflanzenfamilien, the genus 

 Asarca is not separated from the genus Chlorcza, nor is it in Macloskie's 

 representation of the present family. One of the most modern works on 

 orchids is that by Fr. Kraenzlin, entitled " Orchidacearum genera et 

 species," the vol. II, pars I (1904), of which contains the Chlorideae. 

 Here we find Asarca separated from Chloraa. The following enumera- 

 tion of the species of our district is based on that work. 



ASARCA Lindl. 



Kraenzlin distinguishes this genus by (i) the union of the lateral sepals 

 below or behind the labellum ; (2) a very short column united with the 

 claw of the labellum ; (3) two fruiting glands at the base of the labellum ; 

 (4) the hollowed claw of the labellum, resembling a gland. 



A. ARAUCANA Phil. 



Stem 50 cm. long, leafy half-way ; lower leaves sheathing, linear lance- 

 olate, acute; cauline leaves more swollen. Spike mostly few-flowered, 

 bracts lanceolate, surpassing the ovary. Dorsal sepal broadly ligulate, 

 acute, scarcely concave ; laterals broadly ovate, contracted to a tail ; petals 

 obovate, oblong. Nerves papillate near the base. Labellum shortly 

 clawed with 2 basal calli ; the lateral lobes diverging and reflexed, oblong 

 rounded. Gynostemium very short. Flowers white, angled with the 

 ovary with green lines, and green tails of the lateral sepals. 



S. Patagonia, Lago Argentine ; also in Chili. 



A. ARANEANA Phil. 



S. section of Central Chili; S. Chili; Chiloe Id.; N. W. Patagon., Rio 

 Renihue. 



