(193) 



2. S. NiTENS Nutt. Flowers on short pedi- 

 cels. — 0. Tamalpais. Spring. 



3. Arenaria L- Sandwort. 

 Sepals unchanged in fruit. Petals entire. 

 Stamens 5 or 10. Stigmas 3. Capsule ovoid, 

 dehiscent by 3 valves, these valves sometimes 

 2-parted. Flowers white. 



1. A. DouGLASii Torr. & Gray. Valves of 

 the capsule entire; leaves filiform; sepals 

 acute, 3-nerved. — 0. Tamalpais. Summer. 



2. A. Californioa Brewer. Valves of the 

 capsule entire; leaves lanceolate; sepals acute, 

 3-nerved. — 0. Oakland Hills. Spring. 



8. A. PALUSTRIS Watson. Valves of the 

 capsule entire; leaves linear; sepals obtuse, 

 without nerves. Formerly in a marsh near 

 San Francisco, where at present it is extinct. 

 Has not been found in any other locality. 



4. A. MACROPHYLLA Hook. Valves of the 

 capsule 2-cleft; sepals acuminate, 1-nerved. 

 U' — Saucelito. Summer. 



4. Sagina L- Pearlwort. 



Sepals 4 or 5. Petals 4 or 5. Stamens twice 

 4 or twice 5. Stigmas 4 or 5, alternate with 

 tlie sepals. Capsule dehiscent in 4 or 5 valves, 

 opposite to the sepals. — 0. 



1. S. occiDENTALis Watson. Petals white. 

 San Francisco. Spring. 

 9 



