WATER LILY FAMILY 93 



upper opposite, shorter. Pedicels glabrous, J4 m - or l ess ^ong, 

 the flowers therefore in terminal head-like clusters. Sepals 

 acute. Capsule normally with 3 toothed valves. 



Although this Arenaria is common both north and south of 

 the Yosemite, it has been reported but once from within the 

 Park. It inhabits loose, soil at more than middle altitudes. 

 The var. suffrutescens Rob. has woody stems %. in. thick and 

 long pedicels, the flowers in umbels. Var. subcongesta Wats, 

 has flowers in expanded branching clusters. 



5. A. douglasii Fenzl. A nearly glabrous much-branched 

 annual, 2 to 8 in. high. Leaves filiform, not rigid, % to 1 in. 

 long. Flowers numerous, on spreading naked pedicels, larger 

 than in other species (over % in. across). Sepals acutish, 

 narrowly thin-margined. Capsule with 3 entire valves. — In 

 loose soil of open places, mostly at less than 4500 ft. alt.; our 

 only annual species. 



5. SAGINA. Pearlwort. 

 Diminutive annual and biennial herbs with narrowly linear 

 or filiform exstipulate leaves and minute long-pediceled 

 flowers. Petals white and shorter than the sepals, or wanting. 

 Styles 4 or 5. Capsule 1-celled. 



1. S. apetala Ard. Stems nearly erect, not matted. Pedi- 

 cels from the leaf-axils and terminal, minutely glandular, 

 straight. Flower-parts mostly in 4's. Petals minute or want- 

 ing. — Yosemite Valley near Stoneman Bridge. 



2. S. occidentalis Wats. Stems loosely branched, spread- 

 ing. Pedicels axillary and terminal, glabrous, straight. 

 Flower-parts in 5's. Petals nearly equalling the sepals. — To 

 be expected. 



3. S. linnaei Presl. Stems densely matted, 3 in. or less 

 high. Pedicels all terminal, glabrous, often becoming bent 

 or recurved at summit. Flower-parts in 5's. Petals nearly 

 equalling the sepals. — Yosemite Valley near Pohono Bridge 

 and Happy Isles. 



NYMPHAEACEAE. Water Lily Family. 

 Aquatic perennial herbs with horizontal rootstocks and 

 large floating leaves. Represented with us by a single, large- 

 flowered species. 



1. NYMPHAEA. Water Lily. 

 1. N. polysepalum Engelm. Indian Pond Lily. Floating 

 leaves 8 to 12 in. long, 6 to 9 in. broad, with rounded basal 



