CACTACEZ OF THE BOUNDARY. 201 
Seed smaller than that of any other Cereus examined by me, — only 0.4 line in the largest diameter, —rugose from 
confluent owen aang leave large pits between them; albumen none; embryo almost straight, with distinct 
transverse sais 
er, fruit, <a seed identify this species with the Echinocerei, —thus furnishing another instance, if such were 
still mei “ the importance of the organs of fructification in the study and arrangement of the Cactacee, and of the 
fallacy of sasietinls the external shape of these plants to furnish characters for generic or subgeneric division. Without 
the knowledge of the flower and fruit, C. twberosus would no doubt have been classed with the Cerei articulati; while 
in reality it is the slenderest ZHchinocereus, connected with the ordinary ovate or globose forms through C. Berlundieri 
and C. procumbens. 
Subgen. 2. Evucrreus.5 [40] 
> 19. C. Emoryt, E. in Sillim. Journ. : caule cylindrico 2-3-pedali prostrato ; ramis adscendentibus seu erectis ; 
costis 15 tuberculatis ; sinubus acute incisis ; areolis confertis orbiculatis, junioribus fusco-tomentosis ; aculeis rectis 
rigidis gracilibus aciculatis e virescenti flavis numerosissimis intertextis, exterioribus 40-50 tenuissimis stellatim por- 
rectis, centrali singulo robustiore multo ee floribus bagi emp flavis ; tubo breviusculo aculeolato ; bacca 
globosa ‘iceleatbarian? semin obovatis acute carinatis basi acutis lucidis minutissime sub lente Ghiealeie: 
hilo ventrali angusto ; ; cotyledonibus folinceis hamatis Scab us. (Tab. LX. fig. 
ountains, near the coast of California, about San Diego, growing in thick masses, and covering 
patches of 10 or 20 feet square (Dr. Parry); not north of the boundary line (Dr. Le Conte).— Prostrate stems 2-3 feet 
long ; branches 6-9 inches high, 1} inch in diameter; flowers abundant near the top of the branches, rather short, 
yellow, 2 or 25 inches wide. Fruit 14 inch in diameter, densely covered with numerous pulvilli, each bearing 
20 or 25 stiff yellow spines, from 2 to 6 lines in length, 3 of them stouter and longer than the rest, often about an inch 
in length ; some indistinct remains of the dead flower are hidden among the spines. Seed 1.2-1.4 line long, with a 
very prominent keel and linear hilum. The short aculeolate flower, persistent on the spinose fruit, would seem to 
refer our plant to Echinocereus, but the seed and embryo permit no doubt about its position. I have seen specimens 
of a fruit of a columnar Cereus from dha Pacific coast near Mazatlan, sent by the late Dr. J. Gregg, which is a gigantic 
representative of our California fruit, and suggests the idea that on the western coast of our continent several species 
exist . a still unknown section of Cereus. 
is plant, peculiar to the western termination of our spor line, fitly bears the name of the energetic and 
Aer Baek commissioner under whose auspices the greater part of the interesting plants here described have been 
collected, 
20. C. vaRIABILis, Pfeiff., a tall species, 3-10 feet high, common to the east as well as west coast of Sein 
America, extending northward to the mouth of the Rio Grande, and up that stream toward Matamoras. — Ft 
stems lt few and stout spines, but young shoots with 8 ribs and numerous slender spines. Trine 
white, iitioker al « fruit oval, about 3 inches long, spinose, crimson externally and internally. Seeds obliquely 
obovate, engined: nearly amboth,; and shining, 1.5-1.7 line long; hilum subventral, narrowly oblong or linear, 
albumen almost none ; embryo much curved ; cotyledons large, foliaceous, incumbent. (Tab. LX. fig. 
1, E. in Wisliz. Rep.: e radice crassa napiformi erectus, gracilis, 2-3-pedalis ; ramis paucis erectis 
3-6 ala ee aS sepe rufescentibus ; costis acutis; sulcis latis planiusculis; areolis oblongo- 
ian confertis seu subconfertis, junioribus lana e cinereo nigricante demum decidua vestitis; aculeis e basi [41] 
bulbosa’ crassa gas subulatis acutissimis brevissimis nigricantibus, vetustis cinereis, radialibus 6-9 
recurvis, infimis 3 tenuioribus longioribus, centralibus binis superimpositis brevibus, ra singulo; floribus jiakbo 
albidis seu ochroleucis (nocturnis 2); ovarii ovati pulvillis orbiculatis obscuro-villosis vix aculeolatis ; tubi elongati 
sepalis 40-60 squ us lineari-lanceolatis acuminatis, inferioribus aculeolos paucos breves, superioribus plures 
capillares gerentibus ; sepalis interioribus 15-20 et petalis totidem lanceolatis acuminatis ; stylo stamina equante ; 
stigmatibus sub-10 erecto-patulis albidis; bacca ovata basi contracta apice rostra dimentis siccis recurvis 
demum deciduis coronata pulvillis aculeoligeris mox nudatis munita coccinea palpooe ; seminibus magnis oblique 
obovatis rugosis tenuissime tuberculatis ; hilo subbasilari circulari; albumine parcissimo; embryone cotyledonibus 
foliaceis incumbentibus hamato. 
5 This section is proposed here only as a receptacle for our 
few Cerei not included in the other subgenera. It is not im- 
possible that the greater part of the species of this genus will 
it i bable that a care- 
with the great aang of 
refrain from characterizing Eucereus. 
subgenera. Not being familiar 
the species, I 
aed state that the few species ee here have an elongated 
; spines on the flower-bearin sterile part of the 
slant not different ; tube of the or elongated, and beset 
with hairy or spiny palvillts stigmata whitish ; berries usually 
with deciduous (or persistent?) spines; dry remains of the 
flower aa, at length deciduous; seeds weer smooth 
and shining, and the embryo hooked, with curved fo 
cotyledons, 
