NOTES ON CACTE^. 113 



other than is the geuus from Echinocactus, into which it grades 

 through Coryphantha. The new sub-genus Cochemiea^ is in aspect 

 and in its flowers the most distinct of all. 



1. Eamamillaria.f Plants globose or elongated, with watery- 

 juice, and cylindrical or conical grooveless tubercles. Flowers borne 

 usually in a ring near the top of the plant, cup-shaped or expanded, 

 as broad or broader than long. Sepals oppressed. Stamens and 

 styles shorter than the corolla. 



2. Coryphantha. Plants globose or elongated, with wateiy juice, 

 often robust. Tubercles grooved on the upper side. Flowers as in 

 Eumamillaria, but borne at the extremity of the groove in the axils 

 of young tubercles, so usually nearer the vertex of the plant. 



3. Cochemiea n. subgen. Plant.s cylindrical, usually much 

 elongated, with watery juice and grooveless tubercles. Flowers 

 mostly in a ring near the vertex, several times longer than broad, 

 scarlet, tubular, slender, somewhat curved, and oblique with spread- 

 ing, unequal, petaloid sepals, so making the flower apparently double 

 as in Cereus flageUiformis. Stamens and style red, exserted. 



4. Ladescentes. Plants depressed-globose, rarely a little elon- 

 gated. Juice milky. Tubercles usually angular and somewhat 

 leathery. Flowers as in Eumamillaria, but mostly small. 



In the Botany of the Mexican Boundary Survey Dr. Engelmann 

 unfortunately confounded Maniillaria Goodrichii, Scheer, with the 

 species common about San Diego, and the rediscovery of the former 

 now makes it necessary to separate them. 



Mamillaria (Eumamillaria) Goodrichii, Scheer. "M. caule 

 erecto cylindraceo basi ramoso axilis nudis, mamillis coufertissimis 

 parvulis viridibus, pulvillis nudis, aculeis exterioribus 12 diaphane 

 albis rigidiusculis subbifarie patentissimis iutertextis, centralibus 4 

 longioribus basi albidis superne brunneis, infimo validiore uncinato. 



Caulis poll. 4 altus, diametro vix sesquipollicari, basi ramosus, 

 aculeis undique supertextus; mamillse vix conspicuse subtetragone 



* From "Cochemie," the name of one of the extinct Indian tribes of 

 Baja California, from which tlie native races have entirely disappeared. 



1 1 have not been able to determine whether the type of Mamillaria 

 belongs to Eumamilaria or to Lactescentes. 



