igoo] 



BRIEFER ARTICLES 



355 



FIG. 5- 



FIG. 6. Q. rubra. 



lobes are more spatulate or obovate. There is also a variation in the 

 number of lobes; in the majority of flowers examined there were from 

 six to eight, but occasionally one was found with as many as ten. The 

 midrib is distinct at the base, but disappears near the apex of the lobes. 



The perianth is sparingly 



pilose, with the lobes ciliated 



by long slender hairs, giving 



it a very shaggy appearance. 

 QUERCUS MACROCARPA. 



Q. macrocarpa has a very char- 

 acteristic flower. It is more 



deeply lobed than any of the 



macrocarpa. 



preceding species, the sinuses 



extending nearly to the point of attachment. It is 

 the largest of this group, having a diameter of 3-3. 5 mm . 

 The lobes are long and very narrowly linear, five or 

 six times as long as they are wide, and are frequently 

 slightly curled or twisted, making it difficult to separate them from the 

 filaments of the stamens. The midrib is distinct to the apex of the 

 lobes. The perianth is pilose, the hairs being very long and shaggy. 

 QUERCUS RUBRA. The flowers of Q. rubra are much larger than 

 any of the other forms studied, having a diameter of 4-4. 5 mm . They 

 are campanulate and indistinctly five or six-lobed. As the flowers 

 develop the stamens push through the narrow throat and 

 tear the perianth into uneven segments varying in number 

 from two to six. The midrib is distinct and slightly thick- 

 ened at the base, but becomes indistinct about half way to 

 the apex of the lobes. The perianth is nearly smooth or 

 slightly pilose, and the lobes are thinly ciliate with long 

 hairs. 



QUERCUS COCCINEA. Q. coccinea has a perianth that very 

 closely resembles the one just described, although the other 

 FIG. 7. Q. characters of the tree are more frequently confused with Q. 

 coccinea. ve i u tina than with Q. rubra. The perianth is campanulate 

 and slightly six-lobed, with a diameter of 3.5-4 mm . Its four or five 

 stamens as they develop tear it into two or three irregular segments. 

 The midrib is distinct at the base but very soon disappears. The 

 perianth is pilose, and there is a thicker row of cilia along the margin 

 than was found in Q. rubra. 



