CACTACESA 
I. MAMILLARIA, Haw. * 
Subgen. 1. EuMAMILLARIA. 
Plante simplices seu cespitose, tuberculate, aculeigere. 
Tubercula plus minus teretia seu angulata, nunquam sulcata. 
Areole floriferee axillares, ab areolis aculeiferis Pam distinctze, nude seu villose, nunc 
setose. 
Flores ex axillis tuberculorum anni prioris antecedentiumve orti, plerumque parvi incon- 
spicui. 
Ovarium plerumque immersum: bacca versus maturitatem solum (anno secundo in pluri- 
mis) emergens, fere semper clavata, coccinea. 
Semina minuta, plerumque rugulosa seu scrobiculata, rarissime verruculosa, vix levia, fulva, 
fusca, seu nigra. 
Most Mamillaric, heretofore known and cultivated, belong to this may yn which is well 
characterized by the lateral position of the flowers. 
1. M. micromsris (sp. nov.): parvula, simptex, globosa; vertice depresso ; tuberculis minimis 
verruceformibus confertissimis ; areolis solum junioribus lana laxa longa vestitis ; aculeis plu- 
rimis pluriserialibus minutis ex albido cinereis, in plantis junioribus et in tuberculis inferiori- 
bus plantarum adultarum sub-20 equalibus lineam longis radiantibus, in tuberculis floriferis 
(verticem plant adultz versus) 30-40 stellato-porrectis, superioribus 6-8 ceteros bis terve supe- 
rantibus versus apicem clavatis acutis, parte superiore demum deciduo ; floribus minimis sub- 
centralibus ; sepalis petalisque 5; stigmatibus 3 stamina aquantibus; bacca elongata clavata 
coccinea fforis rudimenta dejiciente ; seminibus paucis oblique obovatis basi acutis nigris lucidis 
sub lenté levissime verruculosis, hilo elongato ventrali.t (Tab. I and II, fig. 1-4.) 
* T Ieave the character of the genus as heretofore generally circumscribed. Lemaire’s genus Anhalonium, however, a species of 
which is found in our territory, in my opinion cannot be separated from Jfamillaria so long as the generic character’ te founded 
on the organs of fructification, cat not on the external shape of the plants. The expression “ Jnflorescentia verticalis,’ which I use 
in relation to the subgenera Coryphantha and Anhalonium and to the genus Echinocactus, although in common use, is not strictly 
rrect: the flowers appear on the vertex of the plant, indeed, but not as the prolongation of the main axis; they are, as in all 
og properly lateral, but produced by the yoang growth of the same year, while in all other Cactacez they spring from the 
wth of the preceding or former years, a, consequently, make their appearance more or less on the side of the plant, or, if on 
te top, only on older branches or joints. 
+ Llook at the seed always in such a oe that a8 radicle of the embryo points downward and the cotyledons upward, o 
when curved, upward and forward, or to t the | the seeds figured in this Report are represented in this position, wd 
otherwise stated. We have then one side or face eke by the always more or less distinct compression of the seed) towards 
the beholder, the base below, and the ventral part or edge of the seed to the left, and the dorsal part to the right. 
The hilum is large or small, oe oblong, oval, or elongated, mostly more or less basal, but not rarely sub-ventral or ven- 
tral; it is usually surrounded by mid rim, formed by the thickened testa, smoother than the other parts of the seed. The 
umen, when present, or the vA _ it, which is indicated by a never-wanting thickening of the endopleura, is always found, © 
on the ventral part of the seed. The ba ck or dorsal part of the seed is often more or less carinate, especially towards the babe: 
The testa of the seed is pergamentaceous, yellowish, a brownish, or black ; or it is bard, crustaceous, and then always black; or 
it ig whitish and thick and bony (only in Opuntie.) he surfuce of the sed is smooth, ofted shining, sepia ng be pitted, 
