MACLOSKIE I REVISION OF FLORA PATAGONICA. 205 



C. SEPIUM R. Br. 

 Known also from N. Patagonia, Rio Negro. 



P. 667, 6 lines from foot, add the species : 



2. CONVOLVULUS ARVENSIS Linn. 



Stem striate, angulate, often prostrate. Leaves sagittate, subauricled ; 

 peduncles usually i -flowered, 2-bracted (bracts small, remote). Sepals 

 ovate-rotund ; corolla white or pink. Capsule smooth. 



Widely distributed in Europe, Asia, N. Africa, and America ; in North 

 Patagonia in the district near the mouth of Rio Negro. 



3. C. LACINIATUS Desv. 



Stem filiform, scarcely 3 cm. long. Leaves pinnatisect, the segments 

 filiform, petiole short. Peduncles equalling the leaves, i -flowered, straight ; 

 pedicels 6 mm. long, bracts linear, acute. Sepals ovate, acutish, as long 

 as the leaves ; outer red-silky ; all becoming glabrous ; capsule glabrous. 



S. Chili ; Brazil ; Argentina ; N. Patagonia near the mouth of Rio Negro. 



Fam. 94. POLEMONIACE^E. Macl., p. 667. 



Our views as to the genera and species of this family have been some- 

 what revolutionized by the researches of A. Brand, published in Engler's 

 Pflanzenreich, IV, 250 (1907). 



1. He fixes the limits of the genera by help of the fact that Gilia and 

 Phlox have the mature calyx at length ruptured by the growth of the 

 fruit, and their leaves may be alternate or opposite; whilst the species 

 which are not thus ruptured, and whose leaves are always opposite are 

 made to form the genus Navarretia. Collomia, in distinction from all 

 these, has folds in the sinuses of the calyx, and no rupturing with the 

 enlarging of the fruit ; and Gymnosteris is set apart by its leafless stem. 

 He also cuts up the genus Gilia into subgenera and sections, and estab- 

 lishes some subspecies as well as varieties under them. 



2. The following is an exhibit of his system, as applied to the Pata- 

 gonian forms. 



A i. (Non-Patagonian trees or shrubs, as Cob<za.~) Embryo white. 



A2. Herbs, with greenish embryo. Subfamily Polemonioidea:. 



b\. Corolla regular, except 2 species which have leaves pinnatifid, the lower 



segments mere setae. Tribe Polemoniece (including all the Patagonian forms). 



