MAMMILLARIA 



MAMMILLARIA 



1979 



8-10, reddish tipj>ed: fls. straw-colored, with purplish 

 tips. Ivaiipah, Calif. 

 Var. chlorantha, Kngehn. Cylindrical, sometimes a.s 



much :us It in. lufili: radial sjiincs 20-25, almost in 2 

 sori(\<, firay; ci'nlral.s ti-ll, stouter, ' j- 1 in. long, reddish 

 only at tip: tls. greenish yellow. S. Utah. 



\"ar. Alversonii, Coulter. Foxtail C!actus. Robust 

 and brauehint;, sometimes 10 in. long, glaucous: tuber- 

 cles short and broad, somewhat angled, forming more 

 or less distinct ribs: radial spines numerous; centrals 

 S-14, stout, spreading, blackish half-way down: fls. 

 pink. S. E. Calif. 



29. comOta, Hildmann. Depres.scd-globose or hemi- 

 spherical, small, grayish green : tubercles large, flattened 

 and imbricated; arcoles round: radial sjjines 5-7, stout, 

 short, compressed, radiant, grayish, the upper longer; 

 central 1, stouter, as long as the radials: fls. rose-red. 

 "In age the spines fall otT and the plant, covered with 

 imbricated, scale-like tubercles, reminds one of a pine- 

 apple." Mex. 



30. elephantidens, Lem. Rather large, glaucous 

 green: tubercles very large and thick, becoming hori- 

 zontal or deflexed and somewhat bilobed: spines 6-8, all 

 radial, stout, yellowish or gray, appressed to the plant 

 and somewhat recurved: fls. rose-color, 3 in. in expan- 

 sion. Mex. 



BB. Tubercles never grooved on upper side. 



i:. Fls. large, yellow: tubercles elongated, of loose and soft 

 texture. 



31. longimamma, DC. Cespitose, bright green, form- 

 ing large, low clumps: tubercles sometimes more than 2 

 in. long: spines straight, pubescent; radials 7-10; central 

 1: fls. 2 in. or more in expansion. Mex. 



\'ar. uberifonnis, .Schum. Tubercles darker green: 

 radial spines seldom more than 4; centrals none. 



Var. glob6sa, Schum. Tubercles dark green, very 

 long: radial spines as many as 12; centrals 2-3. 



Var. sphserica, Engelm. Tubercles about 1 in. long: 

 radial spines 12-14; central 1. Texas. 



cc. Fls. smaU, usually white or red: tubercles not elongated. 



D. Seeds black. 



E. Base of seeds brown corky. 



32. tetrancistra, Engelm. (M. pheUdsperma, Engelm.) 

 Ovate or ovate-cylindrical, rather large, simple or 

 sparingly branched from the b;i.se: young axils spa- 

 ringly setose: radial spines 30-60, in 2 series; exterior 

 bristle-like, white; interior stouter and longer, dusky- 

 tipped or purplish; centrals 1-4, longer, brown or black- 

 ish, sometimes all hooked, the upper ones sometimes 

 straight: seed with a brown corky base. S. Calif, to 

 Utah. 



EE. Base of seeds rwt brown corky. 



33. micromeris, Engelm. Cylindrical-clavate, 1-6 in. 

 high, covered by white spines: tubercles only }/2 line 

 long: spines on the body very short, many serial, suc- 

 cessively shorter toward the center, not pungent; in the 

 flowering area the upper tuft of spines having a davatc 

 deciduous tip: fls. iiinkish white, borne at the summit 

 in a dense tuft of wool and spines, directly behind the 

 apex of the tubercle: fr. red, smooth; seed black. Tex;us. 



Var. Greggii, Engelm. Larger in all its parts. This 

 species and its variety really do not belong to Mam- 

 millaria although they are usually placed here by gar- 

 deners. Var. Greggii, which is really specifically distinct 

 from M. micromeris, has been referred to Echinocactus, 

 although superficially it has no resemblance to that 

 genus. Weber constructed for these forms the genus 

 Epithelantha, and this will jirobably be the best dis- 

 position to make of this group. 



34. elongSta, DC. {M. densa. Link & Otto). Erect, 

 6-7 in. long, 1-1 J-^ in, thick: radial spines 16-18, yellow; 



centrals none: fls. white or yellowish. Cent. Mex. — ■ 

 M. mperlna, Purpus, was recently distributed abroad, 

 but has not been seen in this country. It is said to be 

 a form of M . elongala. Kls. and fr. unknown. 



Var. echinata, Schum. {M . cchindia and M. echinaria, 

 DC). Radials as many as 20, yellow; centrals 2-3, 

 brown. — A stout form. 



Var. tenuis, Schum. (M. tenuis, DC. M. minima, 

 Salm). Radial spines about 20, pale yellow; centrals 

 none. — The most slender form, only ' iin. thick. 



Var. stella-aurata, Schum. Sts. somewhat tliicker: 

 spines golden yellow; 1 central usually present. 



35. LeSna, Poselg. Sts. stouter, glaucous, upper axila 

 woolly: radial spines about 30, radiant, slender, white; 

 centrals 6-12, much stouter; the upi)er ones longest, 

 ivory-white at base, dove-color or bluish above. Nuevo 

 Leon, Mex. 



36. decipiens, Scheidw. {M. GuilleminiAna, Lem.). 

 Irregularly cespitose, somewhat clavatc, often rosy: 

 tubercles cylindrical; axils sparingly bristly: radial 

 spines 7-12, whitish; centrals 1-2, brown, longer; all 

 slentler. Mex. 



37. dumetorum, Purjjus. Minute plants, less than 

 1 in. diam.: tubercles prominent, terete, bearing long 

 white hairs in their axils; spines spreading, white except 

 at the yellow bases: fls. 6-7 lines long. Cent. Mex. 



38. frfigilis, Salm. Sts. low, usually as broad or 

 broader than high, extremely [iroliferous, the offsets so 

 lightly attached that they soon fall by their own weight: 

 radial spines 12-14 , white; centrals none or 1, rarely 2, 

 white, with dusky tip. Mex. 



39. lasiacantha, Engelm. Low, usually globose or 

 depressed-globose: tubercles slender, axils naked: radial 

 spines as many as 40-80, feathery; centrals none. Texas. 



Var. denudata, Engelm. (M. Rtlngei, Hort.). Larger, 

 both plant and tubercles: spines naked. 



40. plumosa, Web. Densely cespitose, at length form- 

 ing masses 6-10 in. diam.: axils long -hairy: radial 

 spines about 40, feathered to the tip; centrals none. — 

 This and the preceding are like feathery balls. M. plu- 

 mosa is sold usually under the name of M. lasiacantha, 

 to which it appears to be rather closely related. N. 

 Mex. 



41. senilis, Salm. "Prohferous at base: axils not se- 

 tose: tubercles crowded: spines all white; exterior very 

 numerous, erect-spreading, hair-like, flexTJOUs; centrals 

 4-6, a little stronger, the upper and the lower hooked." 

 Chihuahua, Mex. 



42. barbata, Engelm. Globose-depressed: axils not 

 setose: exterior spines very numerous, pilose; interior 

 stronger, yellowi.sh, 10-15; central solitary, stout- 

 hooked, yellowish, not much longer than the others: 

 fls. small, not remote from the center; sepals fimbriate; 

 berry "green." Near Chihuahua, Mex. 



43. vetula, Mart. Subglobose or becoming sub- 

 cyhndrical: axils not setose: radial spines bristle-like, at 

 first 2.5-30, obliquely spreading, later twice as many and 

 horizontal; centrals 1-3, yellowish brown, scarcely 

 stouter or longer. Mex. 



44. Candida, Scheidw. (M. sphserdlricha, Lem.). At 

 length cespitose, globose, becoming longer: vertex de- 

 pressed: axils setose: radial spines bristle-like, more 

 than 50, horizontal and interwoven; inner spines, 8, 10 

 12, or more, a httle stouter and upright: fls. flesh-color 

 or pinkish. 



45. pusQla, DC. (Cdctus stellhtus, Willd. M. slellaris, 

 Haw.). Low, globular, proliferous, making large 

 ma.sses: tubercles cylindrical, sm.all .and loosely spread- 

 ing; axils with long, hair-like, tortuous bristles: radial 

 spines 12-20, very .soft and flexuous; centrals 4-6, yel- 

 lowish, a little rigid, pubescent: fls. yellowish white. 

 W. Indies. 



