KEY, BASED UPON FRUIT. 11 



/ 3 . Style or remnants of it ; fruit about 



ff. in. long, dryish, in racemes 107. CYRILLA RACEMIFLORA. 



(/*. in. long, juicy, in cymes. 



With glaucous bloom . 157. SAMBUCUS GLAUCA. 



Witliout bloom 229. SAMBUCUS MEXICANA. 



f z . Not crowned with either calyx- teeth or style, 

 g. Sessile, scaly -bracted beneath ; leave? evergreen; fruit 

 h. Smooth flower scales obliterated dark blue; seeds 1-4. 



25. JUNIPERUS VIRGINIANA. 



71 2 . Nearly smooth scales nearly obliterated 



Red-brown, seeds 1-2 167. JUNIPERUS CALIFORNICA. 



Dark-blue, seeds 2-3 168. JUNIPERUS OCCIDENTALS. 



71 3 . Tuburculate with points of flower scales, red brown; seeds usually 4. 



242. JUNIPERUS PACHYPHLOEA. 

 gr*. Pedicellate, not scaly-bracted beneath, slightly 2-3-lobed, 2-3-seeded, 



Black; nutlets indehiscent 126. RHAMMUS PURSHIANA. 



Red; nutlets dehiscent 176. RHAMMUS INSULARIS. 



c 4 . Nut and furnished with an involucral cup or covering. 

 d. Ovoid oblong or ellipsoidal, surrounded at its base with an involucral 



cup (Quercus), acorn borne 



e. On the new wood of the season (i. e. maturation annual) cup 

 /". Less than enveloping the oval acorn, which is 



Obtusely pointed; foliage yellow-green 136. Q. GARRYANA. 



Acutely pointed; foliage bluish-green 214. Q. DOUGLASII. 



f*. About \ enveloping the small 



Ovoid nut f in. long : scales thin 68. Q. MUHLENBERGII. 



Long, narrow nut, often 2 in. long 160. Q. LOBATA. 



/ 3 4 About \ enveloping the nut 

 g. Thick, scales very roughly tubercled, edge of cup rather inturned after 



shedding the nut; foliage 

 h. Yellow-green, deciduous; nut long-ovoid; leaves 



5-9 in. long; lobes rou tided 38. Q. ALBA. 



H-3 in. long, lobes pointed 216. Q. MACDONALDI. 



h 9 . Blue-green, persistent; nut ovid 215. Q. ENGELMANNI. 



gr 8 . Thinner, scales thinnish ; leaves 



Deciduous ; peduncles shorter than petioles 67. QUERCUS PRINUS. 



Persistent; acorns sessile or nearly so, leaves 



Orbicular-oblong 137. QUERCUS AGKIFOLIA. 



Oblong-lancelate 237. QUERCUS EMORYI. 



/ 4 . Scarcely enveloping the oblong-ovoid nut about 1 in. in length. 



116. QUERCUS MICHAUXII. 



/ 6 . About | or more enveloping the nut ; peduncles longer than the 

 petioles ; nut 



in. long, light brown 66. QUERCUS BICOLOR. 



| in. or less long, dark brown 117. QUERCUS VIRENS. 



/. About or more enveloping the nut ; peduncles 



g. Longer than the petioles 66. Q. BICOLOR. 



fir 2 . Shorter than the petioles ; scales 



Very loosely appressed, forming a moss-like fringed margin of cup. 



39. Q. MACROCARPA. 



More closely appressed and not forming a moss-like fringe. 



92. Q. OBTUSILOBA. 



e 9 . On wood of the preceding season (i. e. maturation biennial) ; cup 

 /. Very shallow, almost flat and with long-linear recurved scales. 



138. QUERCUS DENSIFLORA. 

 /*. Saucer-shaped, 

 g. One-fourth enveloping the nut which is 



1 in. or less in length; saucer thin 15. Q. RUBRA. 



1| in. long ; saucer thin at rim 191. Q. TOMENTELLA. 



2 in. or less in length; saucer usually thick 161 Q CHRYSOLEPIS. 



gr*. One-third enveloping the nut; leaves persistent and wooly beneath. 



235. Q. HYPOLEUCA. 

 gr 3 . One-half enveloping an ovoid nut 162. Q. CALIFORNICA. 



