MACLOSKIE I CARYOPHYLLACE/E. 387 



5. ALSINE LANCEOLATA (Poir). 



Leaves lanceolate-oblong, acute, the panicle pubescent. Sepals ex- 

 ceeding the bifid petals. 

 Magellan. Fuegia. 

 (S. LANUGINOSA Rohrb. = Arenaria lanuginosa.} 



6. A. MEDIA (Linn.). Common Chickweed. 



Weak, tufted annual, mostly glabrous, but with a line of cilia along 

 the stem, branches and petioles. Leaves ovate or oval, or the lower 

 cordate, and petiolate. Flowers in terminal, leafy cymes, or also solitary 

 on axillary pedicels. Sepals exceeding the petals. 



(Eurasia, and naturalized in N. Am.) ; at Punta Arenas (J. B. Hatcher, 

 Jan. 10, 1897); Falklands; Fuegia, Ushuaia. Rio Negro ; L. Nahuel- 

 haupi. 



7. A. NEMORUM (L. sub Stellarid). 



Stems weak, glabrous below, downy above. Lower leaves petiolate, 

 cordate ; upper leaves sessile, lanceolate. Panicle dichotomous. Petals 

 bifid, twice as long as the sepals. Seeds orbicular, compressed, margin- 

 ally tubercled. 



(Old World ; Bolivia) ; W. Patagon. 



8. A. ROTUNDIFOLIA (Poir). 



Branches virgate. Leaves petiolate, rounded, fleshy, 3-nerved, sub- 

 mucronate. Panicle terminal. Petals exceeding the sepals. 

 Magellan (not well known). 



5. CERASTIUM Linn. Chickweed. 



Suberect herbs, with terminal cymes. Sepals 5 (4), distinct. Petals 

 emarginate or bifid, rarely none. Stamens 10, rarely fewer. Capsule 

 cylindric, often curved, 10- (S-)toothed. Styles as many as the sepals, 

 rarely fewer. Seeds rough. Flowers occasionally few or solitary. 



Species 50, chiefly in temperate climates. 



KEY TO THE SPECIES. 



A. Leaves mostly sublinear. Flowers in cymes, or subpaniculate. 

 b. Petals exceeding the sepals. 



c. Basal leaves linear-oblong, stem leaves linear-lanceolate. Petal obcordate. 



arvense. 



