404 DESCRIPTION OF PLATES. 
PLATE XXV. 
TICA BREWERI, Watson.—Natural size. Fig. 1. Staminate flower. Fig. 2. Pistillate flower. 
Fig. 3. Achenium, enclosed by the large inner sepals. Fig. 4. Calyx, opened, showing mature ache- 
nium. All enlarged about 10 diameters. 
PLATE XXVI. 
- SISYRINCHIUM ARIZONICUM, Rothr.—Natural size. Fig. 1. Stamen, seen from outside. Fig. 2. 
Stamen, seen from inside. Fig. 3. Styles and stigmas. Fig. 4. Flower, divested of perianth, Fig. 5. 
Capsule. Allenlarged. 
PLATE XXVII. 
TRISETUM WOLFI, Vasey.—Fig. 1. ee natural size. Fig. 2. Spikelet, enlarged 5 times. Fig. 
. Floret, spc the na and linear se 
TRISETUM ALPESTRE, Beauv. ae 4, Natural size. Fig. 5. Spikelet, magnified 6 diameters. 
. Fig. 6. sikelet with see removed. The last should have ders a little pubescence on the stem of 
the cna aes 
, Vasey.—Fig. 7. Natural size. Fig. 8. Flower, enlarged 15 times. Fig. 9. Section 
of stem, Si ate enlarged. 
PLATE XXVIII. 
Poa WHEELERI, Vasey.—Fig. 1. Plant, natural size. Fig. 2. Spikelet, magnified 5 times. Fig. 
3. Upper floret, with rudiment, enlarged 9 times. 
PLATE XXIX. 
Festuca THURBERI, Vasey.—Natural size. Fig. 1. Spikelet, enlarged 5 times. Fig. 2. Upper 
glume. Fig. 3. Lower ghentie. Fig. 4. Upper palet. Fig. 5. Lower palet. 
PLATE XXX. 
THOLENA HOOKERI. —Ordinary size. Fig. a Reale of oe rootstock. Fig. 2. Scale from the 
base of the stalk. Fig. 3. Segment of one of the pin g d the slight] 
margin. The details are enlarged about 6 diameters 
3 
iP g ghtly recurved 
° 
