82 MISSOURI BOTANICAL GARDEN. 
less prominent and conspicuous. One of the characters of 
Crataegus lanuginosa is the unusual development and num- 
ber of the spines. On Crataegus dasyphylla the spines are 
smaller and much less numerous. 
MICROCARPAE. 
CRATAEGUS APIIFOLIA, Michaux. 
The type of this species is from the southeastern states, 
and in the southeastern states so far as I have been able to 
observe the anthers are bright rose color. West of the Mis- 
sissippi River, however, where Crataegus aptifolia is very 
common and grows to its largest size, the anthers are yel- 
low. There appears to be no other difference in the plants 
from the two regions, and this difference in the color of the 
anthers seems a purely geographical one, for there is yet no 
evidence that plants with rose-colored and yellow anthers 
ever mingle. This geographical variety appears so remark- 
able that it should be recognized, but until other differences 
ean be found the trans-Mississippi tree had best be called 
variety flavanthera, n. var. 
This is an addition to the Missouri flora, for Mr. E. J. 
Palmer found a single plant at Joplin, May 10, 1907, and 
October 28, 1908. He has also found it at Branson in Taney 
County, on October 20, 1907. This variety is very common 
in southern Arkansas, eastern Texas and western Louis- 
jana. 
TOMENTOSAE. 
Crataegus simulata, n. sp. 
Leaves ovate to oval or slightly obovate, acute or abruptly acumi- 
nate, cuneate or rarely rounded at the base, and coarsely serrate, with 
straight glandular teeth; nearly fully grown when the flowers open 
from the 10th to the middle of May and then yellow-green, roughened 
above by short white hairs, and villose on the midribs and on the 
under side of the primary veins, and at maturity thin, glabrous, yel- 
low-green, 4-4.5 em. long and 2.5-3 cm. wide, with slender midribs 
and usually 5-7 pairs of thin primary veins; petioles stout, broadly 
wing-margined sometimes nearly to the base, densely villose on the 
upper side early in the season, becoming glabrous, 1-1.2 em. in length; 
leaves on vigorous shoots abruptly acuminate, concave-cuneate at the 
base, more coarsely serrate and occasionally slightly lobed above the 
