176 CACTACEH OF THE BOUNDARY. 
Fig. 14. Seeds of O. BASILARIS: an irregular and a very regular one from the same fruit. 
Fig. 15. Seed of O. HysTRICINA. 
Figs. 16-19. Seeds of different forms of O. MissourrIENsIs; 16, var. RUFISPINA; 17, var. PLATYCARPA, h seedling of 
same; 18, var. ALBISPINA; 19, var. TRICOPHORA. 
Plate XXIV. figs. 1-2. O. Missovriensis: 1, var. with smaller fruit and seeds from the upper Missouri; 2, ‘var. 
MICROSPERMA. Ales See Plate XIV. figs. 5-7.) 
Fig. 3. O. SPHHROCARPA 
Fig. 4. i of O. ERINACEA: the embryo g shows ones obliquity of the cotyledons. 
Fig. 5. Seed of O. FraciILIs: from the Yellowstone Riv 
Fig. 6. Seed of O. cLavaTA: the embryo g oblique 
Fig. 7. Seed of O. aK embryo g nearly accumbent. 
Fig. 8. Seed of O. EcHrNocaRPA: one of the seeds quite regular, the other irregular; embryo g g always regularly 
accumbent ; /& and 7 seedlings with the very narrow and thick cotyledons crossing each other, one of them bearing the shell of 
the seed. 
Figs. 9-10. Seeds of O. WHIPPLEI: 9, seed of the plant represented in Plate ae fig. 2, seed larger, commissure per- 
fectly linear, cotyledons oblique ; 10, seeds of the other specimen, Plate XXII. fig. 1, seeds smaller, of different shapes, com- 
missure a little wider, cotyledons oblique, in 7 il separated, in & three cotyledons, of which 7 is a transverse section, 
A seedling aly very narrow and long cotyledon 
Fig. 11. eds of O. ACANTHOCARPA, of different shapes, all from one fruit. 
Fig. 12. Seeds of O. arBorEsceENs, of different shapes, belonging to the plant figured Plate XVII. fig. 5, smaller than 
those sent by other collectors, embryo g regularly incumbent. 
Figs. 13-15. Seeds of O. vacinaTa: 13, 14, seeds of different sizes, from the plant Plate XX. fig. 1, — the smaller one 
is empty, and perhaps not fully formed ; 15, seed of the same species, collected in Mexico by Dr. Gregg. Cotyledons regularly 
incumbent. 
Figs. 16-19. Seeds of O. FRUTESCENS: 16, var. LONGISPINA, from the Llano Estacado (Plate XX. fig. 2); 17, same 
from Mexico, Dr. Gregg; 18, same from Williams’s River, branch of the great Colorado; 19, var. BREVISPINA, from Texas, 
Lindheimer. In all these the cotyledons of the embryo are regularly incumbent. 
Fig. 20. Seeds of O. TEssELaATA : embryo oblique or almost accumbent. 
the figures are of natural size unless the contrary is expressly stated. They were drawn with the grea 
accuracy, partly from living and in part from dried specimens, by Mr. Paulus Roetter, of St. Louis, under the jena [58] 
perintendence of Dr. Engelmann. The drawings made on the spot by Mr. H. B, Méllhausen, the artist of the 
dition, greatly aided the work, and were made use of, and even partly copied, especially in the plates exhibiting the "Cylindrie 
Opuntia. 
VIII. —CACTACEZ OF THE BOUNDARY. 
From Report oF THE UNITED StaTEs AND MExIcAN BounDARY SURVEY, UNDER THE ORDER OF Lievt.-CoL. W. H. Emory, 
Masor First Cavatry, anp UniTep States Commissioner. II. Parr I. pp. 1-78. Washington, 1859. 
I. MAMILLARIA, Haw. 
Subgen. 1. EvMAMILLARIA. 
Plantz simplices seu czespitosee, tuberculate, aculeigere. [3] 
Tubercula plus minus teretia seu angulata, nunquam sulcata. 
Areolz floriferz axillares, ab areolis aculeiferis penitus distinctee, nude seu villose, nunc ria 
rnin ex axillis tuberculorum anni prioris antecedentiumve orti, plerumque parvi inconspicu 
m plerumque immersum: bacca versus maturitatem solum (anno secundo in plarimis) emergens, fere 
semper Gein, coccinea. 
1 T leave the character of the genus, as heretofore, generally although in common use, is not strictly correct. 
circumscribed. Lemaire’s genus Anhalonium, however, —a appear on the vertex of the plant, indeed, but not as the pro- 
species of which is found in our territory, —in my opinion, longation of the main axis. y are, as in all pony 
nnot be se m Mamiillaria so long as the generic properly lateral, but produced by ye young growth of et 
character is founded on the organs of fructification, and not same year, while in all other Cactacee they spring from pe 
the external shape of the plants. The expression ‘ Inflo- growth of the preceding or former years; and ¢ a 
rescentia verticalis,” which I use in relation to the subgenera make their appearance more or less on the side of the plant, 
Coryphantha and Anhalonium and to the genus Echinocactus, or, if on the top, only on older branches or joints. . 
