26 THE CACTACEAE. 



Illustrations: Cact. Journ. i: 43; Forster, Handb. Cact. ed. 2. 399. f. 41; Riimpler, 

 Sukkulenten 205. f. 116; Diet. Gard. Nicholson 4: 564. f. 36; Suppl. 517. f. 552; Goebel, 

 Pflanz. Schild. i : pi. i , f . 6 ; Amer. Gard. 1 1 : 460 ; West Amer. Sei. 13:39; Caet. Mex. Bound, 

 pi. 14, 15; Cycl. Amer. Hort. Bailey 2: f. 746a, 1355; Stand. Cycl. Hort. Bailey 4: f. 2314; 

 Gartenflora 42: 543. f. iii; Schelle, Handb. Kakteenk. 237. f. 152; Bait. Cact. Journ. i: 

 21; Watson, Cact. Cult. 165. f. 64; ed. 3. f. 41, as Mammillaria macromeris. 



Figure 25 is from a drawing of two tubercles, showing the grooves on the upper side, 

 of a plant sent by Mrs. S. L- Pattison from western Texas. At the base of one is shown the 

 flower-scar; in the other is a small bud. 



2. Coryphantha runyonii sp. nov. 



Forming low clumps, sometimes 5 dm. in diameter, grayish green, with a thick, elongated tap- 

 root ; tubercles rather short, i to 2 cm. long, terete or somewhat flattened, grooved on the upper half, 

 rarely more, but never to the base; radial spines 6 or more, spreading, acicular, very variable in 

 length, 3 cm. long or less, sometimes all yellow or sometimes one or more in a cluster brown, other- 

 wise yellow ; central spines on young plant solitary, dark brown to black but in old plants sometimes 

 2 or 3, somewhat angled, up to 6 cm. long; flowers large, purple, 5 cm. broad; outer perianth- 

 segments ciliate; inner perianth- segments spatulate, oblong, acute; fruit green; seeds brown. 



Found along the Rio Grande from Brownsville to Rio Grande City. This species has 

 been repeatedly observed by Robert Runyon, from whom we received Uving plants in 

 1921 (No. 15, type) and 1922. 



Mr. Runyon wrote us about the plant as follows : 



"I also inclose you herewith two photographs of the plant you have called Coryphantha runyonii. 

 I first became interested in this plant about two years ago when I saw it growing near Rio Grande, 

 Texas. It was found at one place only, but in abundance. It grows on the gravel hillside and 

 down in the lower land in a kind of white silt soil. 



"The fruit is green and the flowers are a very pretty pink to a purple with a delicate fringed 

 petal. The tubercles are very irregular. The largest plants are about 18 inches in diameter and 

 would weigh not less than fifty pounds." 



Plate I, figure i, is from a photograph sent us by Robert Runyon. 



3. Coryphantha ottonis (Pfeift'er) Lemaire, Cactees 34. 1868. 



Mammillaria ottonis Pfeiffer, Allg. Gartenz. 6: 274. 1838. 



Echiuocactus ottoniamis Poselger, Allg. Gartenz. 21: 102. 1853. 



Cactus ottonis Kuntze, Rev. Gen. PI. i: 261. 1891. Not Lehmann, 1827. 



Mammillaria bussleri Mundt in Schumann, Monatsschr. Kakteenk. 12: 47. 1902. 



Mammillaria golziana Haage jr., Monatsschr. Kakteenk. 19: 100. 1909. 



Simple, globular to short-cylindric, 12 cm. high or less, 8 cm. in diameter, glaucous to grayish 

 green; radial spines 8 to 12, nearty equal, 8 to 10 mm. long; central spines 3 or 4, longer and a little 

 stouter than the radials; axils of flowering tubercles woolly; flowers white, 4 cm. long; outer perianth- 

 segments oblong, obtuse; inner perianth-segments apiculate; stigma-lobes 10, green. 



Type locality: Mineral del Monte, Mexico. 



Distribution: Central Mexico. 



The name here used was proposed by Lemaire (Cactees 34) in 1868 but not formally 

 published. Mammillaria ottonis tenuispina Pfeiffer is sometimes used but we have seen 

 no formal description. 



Nicholson (see also Watson, Cact. Cult. 168. f. 66; and ed. 3. f. 40) describes and 

 illustrates (Diet. Gard. Nicholson Suppl. 517. f. 553) under this name a very peculiar speci- 

 men in which the flowers are borne away from the top of the plant; it is doubtless not 

 congeneric with this species. Nicholson's description is here quoted: 



