REPORT OF THE STATE BOTANIST 1903 41 
some of the fruit without pressing. It is important that the 
three collections be made from the same tree or shrub in order to 
avoid the danger of confusing two or more closely related species. 
Sometimes two or more species grow together in one clump and 
in such cases special care is necessary lest the intermingled 
branches lead to inextricable confusion of species. To guard 
against any slip of memory it is well to mark the trunk of every 
tree or shrub from which specimens are taken, giving to each a 
number corresponding to a number attached to the Specimens 
taken from it. With a pocket knife shave the rough bark from a 
small place on one side of the trunk and inscribe the number on 
this smooth place. It is well in every case to select the same side 
of the trunk, for example, the north side. Then no time need be 
lost in looking for the mark on the other sides. 
Because the branches are often coarse and crooked and armed 
with stout spines, strong pressure is necessary to make good 
herbarium specimens of them. A screw press is recommended for 
this purpose. It is also well to loosen the spines by partly split- 
ting them from the branch before putting the samples in press. 
It is desirable to know the date of each collection. It should 
therefore be recorded on the ticket. 
PRUINOSAE 
Fruit medium, red when ripe, pruinose; stamens 10-20; leaves 
thick or subcoriaceous, commonly bluish green, glabrous when 
mature. 
The pruinosity of the unripe fruit is one of the most available 
characters by which to recognize the species of this group. The 
two species here described differ in the number of their stamens 
and the color of their anthers. 
Stamens 20, anthers pale yellow or whitish C. conjuncta 
Stamens 10, anthers pale purple or pink C. dissona 
Crataegus conjuncta Sarg. 
Conjoined thorn 
Rhodora, 5:57 
Large shrub 8-12 feet tall with widely spreading or ascending 
branches; leaves oyate, broadly ovate or oval, acute or subacu- 
