STAXDLEY TREES AND SHRUBS OF MEXICO. 961 



4- Neolloydia beguinii (Weber) Britt. & Rose, Bull. Torrey Club 49: 252. 

 1922. 



Echinocactus beguinii Weber ; Schum. Gesamtb. Kakt. 442. 1898. 



Zacatecas and Coahuila ; tj'pe probably from Saltillo, Coaliuila. 



Plant body cylindric, 10 to 15 cm. high ; ribs spiraled and divided at 

 regular intervals into low tubercles resembling geometric figures, pale bluish 

 green but nearly hidden by the dense covering of spines ; radial spines 20 

 or more, white but with dark tips ; centrals usually single, longer and ascend- 

 ing ; flowers appearing from the top of the plant, 3 to 4 cm. long, bright 

 pink ; ovary without scales ; seeds black, tubercled. 



5. Neolloydia ceratites (Quehl) Britt. & Rose, Cactaceae 4: 16. 1923. 

 Mammillaria ceratites Quehl, Monatsschr. Kakteenk. 19: 155. 1909. 

 Mexico. 



Simple or in small clusters, short-cylindric, 6 to 10 cm. high ; tubercles 

 somewhat 4-angled, more or less arranged in ribs ; young areoles very woolly 

 but becoming naked ; radial spines 15 to 20, more or less spreading, white, 

 1.5 cm. long ; central spines 5 or 6, longer and stouter than the i-adials, blackish 

 above; flowers purple, 3 to 3.5 cm. long; perianth segments oblong, acute. 



6. Neolloydia conoidea (DC.) Britt. & Rose. Bull. Torrey Club 49: 252. 1922. 

 Mammillaria conoidea DC. M§m. Mus. Hist. Nat. 17: 112. 1828. 

 Mammillaria grandiftora Otto; Pfeiff. Enum. Cact. 33. 1837. 

 Mammillaria diaphanacantlia Lem. Cact. Aliq. Nov. 39. 1838. 

 Mammillaria inconspicua Scheidw. Bull. Acad. Brux. 5: 495. 1838. 

 MammAllaria echinocactoides Pfeiff. Allg. Gartenz. 8: 281. 1840. 

 Mammillaria scJieeri Miihlenpf. Allg. Gartenz. 13: 346. 1845. 

 Mammillaria strobiliformis Engelm. in Wisliz. Mem. North. Mex. 113. 1848. 

 Zacatecas and elsewhere in northern Mexico. 



Sometimes simple but usually cespitose, sometimes forming large clusters, 

 often branching or budding above, short-cylindric ; tubercles in 5 or 8 spiral 

 rows, obtuse, their axils very woolly ; spines very numerous, often completely 

 covering the plant ; radial spines white, 25 or more, widely spreading, 8 to 

 10 mm. long ; central spines several, stouter and longer than the radials, 1 to 

 3 cm. long, blackish ; flo\A'ers large ; outer perianth segments dull purple with- 

 out, lighter toward the margins, the inner ones rich purple ; fruit compressed, 

 globose, dull yellow, mottled with red, becoming dry and papery, then brown ; 

 seeds 1 mm. in diameter. 



42. MAMILLOPSIS Weber; Britt. & Rose, Cactaceae 4: 19. 1923. 



Cespitose cacti, often forming large clusters, globular or short-cylindric, 

 completely hidden under a mass of long soft white hairlike spines ; tubercles 

 not arranged in ribs, more or less conic, not grooved above, spine-bearing at 

 the apex, their axils pubescent and bristly ; radial spines numerous, weak, 

 straight ; central spines 4 to 6, with yellow hooked tips ; flowers from near 

 the top of the plant but apparently from the axils of old areoles, with a regular 

 straight slender scaly tube 'and a broad spreading limb ; perianth segments 

 oblong, obtuse; stamens and style erect, long-exserted beyond the tube; scales 

 on flower tube orbicular, obtuse. 



Only the following species are known. 



Flowers 6 to 7 cm. long, orange-yellow 1. M. senilis. 



Flowers 3 em. long, deep red 2. M. diguetii. 



