134 THE CACTACEAE. 
Type locality: Not cited. 
Distribution: Doubtless Mexico, but not known from wild plants. 
Mrs. K. Brandegee, some years ago (Zoe 5: 9. 1900), called attention to the fact that 
this fragile little plant did not answer Pfeiffer’s description of Mammiullaria gracilis-and 
that Salm-Dyck had suggested the very appropriate name of M. fragilis, which we have 
adopted here. The plant is known in the trade as Mammillaria gracilis pulchella, under 
which designation we received plants from Haage and Schmidt in 1921. 
Illustrations: Schumann, Gesamtb. Kakteen 552. f. 90 (?); Bliihende Kakteen 2: 
pl. 68; Monatsschr. Kakteenk. 6: 2; Méllers Deutsche Gart. Zeit. 25: 475. f. 8, No. 19; 
Gartenwelt 12: 333, as Mammillaria gracilis. 
Figure 145 is from a photograph sent us by L. Quehl. 
2 ©. Neomammillaria elongata (De Candolle). 
7 Mammiilaria elongata De Candolle, Mém. Mus. Hist. Nat. Paris 17: 109. 1828. 
Mammillaria subcrocea De Candolle, Mém. Mus. Hist. Nat. Paris 17: 110. 1828. 
>Mammiillaria intertexta De Candolle, Mém. Mus. Hist. Nat. Paris 17: 110. 1828. 
Mammillaria tenuis De Candolle, Mém. Mus. Hist. Nat. Paris 17: 110. 1828. 
Mammillaria tenuis media De Candolle, Mém. Mus. Hist. Nat. Paris 17: 110. 1828. 
? Mammillaria densa Link and Otto, Icon. Pl. Rar. 69. 1830. 
Mammillaria echinata densa Pfeiffer, Enum. Cact. 6. 1837. 
? Mammillaria stella-aurata Martius in Zuccarini, Abh. Bayer. Akad. Wiss. Miinchen 2: 101. 1837. 
ZA Mammillaria minima Reichenbach in Terscheck, Suppl. Cact. Verz. 1. 
Echinocactus densus Steudel, Nom. ed. 2. 1: 536. 1840. 
— Mammiillaria tenuis minima Salm-Dyck in Walpers, Repert. Bot. 2: 272. 1843. 
Mammillaria subcrocea intertexta Salm-Dyck, Cact. Hort. Dyck. 1844. 13. 1845. 
Mammillaria elongata intertexta Salm-Dyck, Cact. Hort. Dyck. 1849. 12. 1850. 
Mammillaria elongata subcrocea Salm-Dyck, Cact. Hort. Dyck, 1849. 12. 1850. 
Mammillaria subcrocea rufescens Salm-Dyck, Cact. Hort. Dyck. 1849. 100. 1850. 
Mammillaria stella-aurata gracilispina Salm-Dyck, Cact. Hort. Dyck. 1849. 101. 1850. 
? Mammillaria anguinea Otto in Salm-Dyck, Cact. Hort. Dyck. 1849. 101. 1850. ° 
? Mammillaria subechinata Salm-Dyck, Cact. Hort. Dyck. 1849. 101. 1850. 
? Mammillaria rufocrocea Salm-Dyck, Cact. Hort. Dyck. 1849. 102. 1850. 
Cactus anguineus Kuntze, Rev. Gen. Pl. 1: 260. 1891. _ 
Cactus densus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Cactus elongatus Kuntze, Rev. Gen. Pl. 1: 260. 1891. Not Willdenow, 1813. 
Cactus intertextus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Cactus minimus Kuntze, Rev. Gen. Pl. 1: 260. 1891. 
Cactus stella-auratus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus subcroceus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Cactus subechinatus Kuntze, Rev. Gen. Pl. 1: 261. 1891, 
Cactus tenuis Kuntze, Rev. Gen. Pl. 1: 261. 1891. , 
Mammillaria elongata tenuis Schumann, Gesamtb. Kakteen 520. 1898. 
Mammillaria elongata stella-aurata Schumann, Gesamtb. Kakteen 520. 1898. 
Mammillaria elongata anguinea Schumann, Gesamtb. Kakteen 521. 1898. 
Mammillaria elongata rufocrocea Schumann, Gesamtb. Kakteen 521. 1898. 
Densely cespitose, forming small clumps, erect, ascending or prostrate, 3 to 10 cm. long, 1 to 
1.5 cm. in diameter, almost covered by a mass of interlocking spines; tubercles arranged in a few 
rows, usually in spirals, short, their axils naked; spines usually all radial but sometimes with 1 por- 
rect central spine, yellow or with brown tips, more or less recurved, 8 to 12 mm. long; spine-areoles 
pubescent when young; flowers at the upper part of the plant, white or nearly so, 6 to 7 mm. long; 
perianth-segments about 12, rather broad, obtuse or sometimes apiculate. 
Type locality: Mexico. 
Distribution: Eastern Mexico. 
Mammillaria supertexta rufa is referred to M. elongata intertexta by Labouret (Monogr. 
Cact. 68. 1853). 
Mammillaria caespitosa was first listed by De Candolle (Prodr. 3: 460. 1828). It 
next appears in 1830 as a synonym in a list of the cacti of the Botanical Garden of Berlin. 
In 1837 Pfeiffer (Enum. Cact. 6) gives it as a synonym of M. echinata densa. 
The three varieties Mammillaria tenuis arrecta, M. tenuis coerulescens, and M. tenuts 
derubescens were garden names in the Botanical Garden at Berlin, listed by Férster (Handb. 
Cact. 240. 1846). 
