74 the; cactaceab. 



Type locality: San Jorge, Lower California. 



Distribution: Lower California, San Ouintin, and southward. 



If we are right in referring Mammillaria gabbii here, this species was first collected by 

 W. M. Gabb in southern Lower California in 1867 and was described by Dr. Engelmann as 

 a new species but was not published. In 1894 Dr. Coulter published Engelmann's descrip- 

 tion, but used the name of Cactus gabbii. On a previous page, however, he published 

 Cactus brandegeei which, if the same, takes precedence. 



We have placed this species next to N eomammillaria arida, which is known to have 

 nearly terete tubercles, while A^. brandegeei is described as having angled tubercles, as they 

 certainly are in herbarium specimens; whether this species has angled or terete tubercles 

 in life we are in doubt. 



We have not seen fresh fruit of this plant but Schumann describes it as white, which is 

 unusual in this genus ; it is also peculiar in bearing several small scales. 



Illustrations: Bliihende Kakteen 2: pi. 119; Schumann, Gesamtb. Kakteen Nachtr. 

 137. f. 34; Monatsschr. Kakteenk. 11: 153, as Mammillaria brandegeei. 



7. Neomammillaria gummifera (Engelmann). 



MamniiUuria «iim}iiifera Engelmann in Wislizenus, Mem. Tour North. Mex, 105. 1848. 

 Caclus giiinmiffr* Kuntze, Rev. Gsn. PL i: 260. 1891. 



Depressed-globose, 8 to 12 cm. in diameter; tubercles light green, milky, somewhat 4-angled; 

 axils of tubercles and spine-areoles white-tomentose when young; radial spines 10 to 12, ascending, 

 white with brownish or even blackish tips, the lower ones stouter and longer than the others, often 

 2 to 2.5 cm. long and somewhat recurved; central spines i or 2, sometimes 4; flowers 3 cm. long, 12 

 to 25 mm. wide when fully open, brownish red outside; inner perianth-segments reddish white with 

 dark red band in middle. 



Type locality: Cosihuiriachi, Chihuahua. 



Distribution: Northern Mexico. 



This species was collected by Dr. A. Wislizenus in the state of Chihuahua, Mexico, 

 about 1846. Specimens were sent to Dr. Engelmann at St. Louis, who described it in 

 1848 but without seeing flowers or fruit; two years afterward he described the flowers but 

 the fruit is yet unknown. In 1894 Dr. J. M. Coulter redescribed the species, stating that 

 it had never been re-collected. Professor Schumann in his Monograph does not recognize 

 it, but refers it to his list of doubtful species. In 1908 Dr. Rose visited the type locality 

 and obtained a single living specimen. 



Illustrations: Cact. Mex. Bound, pi. 9, f. 18 to 20, as Mammillaria gummifera. 



8. Neomammillaria macdougalii (Rose). 



Mammillaria macdougalii Rose, Stand. Cycl. Hort. Bailey 4: 1982. 1916. 



Usually low and flattened on top, but very old plants sometimes nearly globular and then 1 2 to 

 15 cm. in diameter with a carrot-shaped root; tubercles flattened dorsally, strongly angled, deep 

 green; young areoles bearing white wool, but becoming naked in age; axils of tubercles often bearing 

 long white wool; radial spines 10 to 12, white or somewhat yellowish, the lowei ones a little stouter, 

 brown or black at top or sometimes throughout; central spines i or 2, stout, yellowish, brown-tipped, 

 similar to the radials; flowers 3.5 cm. long, cream-colored; outer perianth-segments short-limbriate; 

 fruit red, clavate, 3 cm. long. 



Type locality: Near Tucson, Arizona. 



Distribution: Southeastern Arizona. 



Figure 65 is from a photograph of a plant collected by Dr. MacDougal in the Santa 

 Catalina Mountains ; figure 67 is from a photogragh of another plant sent by Dr. MacDougal 

 from the same region in November 1909. 



*Coulter writes this name Cacliis gummijerus (Contr. U. S. Nat. Herb. 3: 98. 1894). 



