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27。 Cactus rhodanthus sulphureospinus。

  Mamillaria sulphurea  Forst。 Handb。 Cact。 (1846); not Cactus     sulphureus Gill; (1830)。    Mamillaria rhodantha sulphurea  Salm; Hurt。 Cact。 Dyck。 11 (1850)。

Central spines sulphur…yellow; otherwise like the species。  Type unknown。

San Luis Potosi。

Specimens examined: San Luis Potosi (Pfeiffer; with no number or date; Eschanzier of 1891)。

The varietal distinction maintained seems a small one; but it is constant and striking; so far as can be discovered。

28。 Cactus capillaris。

  Mamillaria lanifera  Salm; Cact。 Hort。 Dyck。 98 (1850); not Haw。   Cactus laniferus  Kuntze; Rev。 Gen。 Pl。 250 (1891)。

Cylindrical and erect: tubercles crowded; conical; glaucous; with axillary bristles: radial spines capillary and very numerous; white and crisped; entirely covering the plant; central spines 4 to 6; rigid; straight and spreading; straw…colored; 8 to 12 mm。 long: flowers equaling the tubercles; the yellow petals striped with red: fruit unknown。  Type unknown。

Referred to Mexico in general; but definitely known only from Coahuila。

Specimens examined: Coahuila。 (Palmer of 1880)。

There is a confusion of synonymy between this species and C。 rhodanthus; both having been named Mamillaria lanifera。 The earlier M。 lanifera of Haworth; however; is clearly M。 rhodantha of Link & Otto; and although Prince Salm…Dyck revived the name for the present species; the law of homonyms will not permit it to stand。  The name proposed refers to the abundant display of capillary radial spines; which is probably the most notable feature。

29。 Cactus palmeri; sp。 nov。

Cylindrical: tubercles crowded; glaucous; cylindrical (somewhat broadest above); about 4 mm。 long; with dense axillary wool containing bristles: radial spines 25 to 30; very slender and white but rigid; about 5 mm。 long; spreading or somewhat radiant; entangled with those of neighboring tubercles; and so covering the whole plant; central spines 3 to 5 (usually 4); more robust; erect or slightly divergent; brownish with darker tip; 7 to 8 mm。 long: flowers small: fruit clavate and scarlet: seeds black and strongly pitted; 0。5 to 0。8 mm。 in diameter。  Type; Palmer 921 in U。 S。 Nat。 Herb。

San Benito Island; off the west coast of lower California。

Specimens examined: Lower California; San Benito Island (Palmer 921 of 1889; reported as Mamillaria Goodrichii)。

Very closely allied to C。 capillaris of eastern Mexico。

30。 Cactus stellatus  Willd。 Enum。 Suppl。 30 (1813)。

  Cactus pusillus  DC。 Cat。 Hort。 Monsp。 184 (1813); not Haw。     (1803)。    Mamillaria pusilla  DC。 Prod。 iii。 459 (1828)。

A very common West Indian species; apparently differing from the variety only in the very much fewer (12 to 20) radial spines; although numerous specimens; both dried and living; were examined for additional characters。  This difference; however; is so constant and striking that; taken together with the wide geographical separation; it should stand as varietal。

31。 Cactus stellatus texanus (Engelm。)。

  Mamillaria pusilla texana  Engelm。 Syn。 Cact。 216 (1856)。   Mamillaria texana  Young; Fl。 Texas; 279 (1873)。

Ovate…globose; 2。5 to 3 cm。 in diameter; 2。5 to 6 cm。 high; proliferous and at length cespitose: tubercles 7 to 9 mm。 long; the long axillary wool intermixed with several coarse twisted bristles: radial spines very numerous; in many series; the outer ones (30 to 50) capillary; white; elongated and flexuous or crisped (12 to 16 mm; long when straightened); the inner ones (10 to 12) more rigid; shorter (6 to 8 mm。); puberulent; whitish or yellowish; usually dark…tipped; central spines 5 to 8; rigid; straight; pubescent; unequal; white below and reddish or dark above: flowers 1。5 to 2 cm。 long; the yellowish…white petals with reddish median band: fruit 1。5 to 2 cm。 long: seeds black and shining; conspicuously pitted; 1。2 mm。 long。 (Ill。 Cact。 Mex。 Bound。 t 5。)  Type; Bigelow specimens in Herb。 Mo。 Bot。 Gard。

From the mouth of the Rio Grande to El Paso; Tex。; and southward into Coahuila and Chihuahua。  Fl。 March…May。

Specimens examined: Texas (Bigelow of 1853; Nealley of 1892): Coahuila (Bigelow of 1853): also growing in Mo。 Bot。 Gard。 1892 and 1893。

The exterior capillary spines cover the whole plant as with a coarse wool。

32。 Cactus pringlei; sp。 nov。

Globose (?); 5 cm。 in diameter: tubercles short…conical; about 6 mm。 long; with very woolly axils: radial spines 18 to 20; setaceous…bristly and radiant; 5 to 8 m in。 long; central spines 5 to 7 (usually 6); stout and horny; more or less recurved; spreading; 20 to 25 mm。 long; all straw…colored; but the centrals darker: flowers deep red (darker; even brownish; outside); 8 to 10 mm。 long: fruit unknown。  Type; Pringle of 1891 in Herb。 Gray。

San Luis Potosi。

Specimens examined: San Luis Potosi (Pringle of 1891)。

Evidently a member of the Chrysacantha group and near C。 rhodanthus sulphureospinus; but differs in the much shorter tubercles; straw…colored spines; shorter radials; much longer centrals; and smaller darker flowers。

33。 Cactus sphaerotrichus  (Lem。) Kuntze; Rev。 Gen。 Pl。 261     (1891)。

  Mamillaria sphaerotricha  Lem。 Cact。 33 (1839)。

Depressed…globose: tubercles cylindrical; obtuse; with some axillary bristles: radial spines very much crowded; exceedingly numerous; radiant; very slender and bristle…like; white; central spines 6 to 10 and even more; erect and more rigid: flowers pale reddish: fruit unknown。  Type unknown。

Referred to Mexico in general; but reported only from San Luis Potosi。

Specimens examined: Mexican specimens from Hort。 Dyck in 1857; from Hort。 Pfersdorff in 1869; and growing in Mo。 Bot。 Gard。 1893 (from material sent by Pringle from San Luis Potosi)。

  ++ The single central spine shorter than the radials (in C。      longimamma centrals often more than one and somewhat longer)。

34。 Cactus gabbli; sp。 nov。

  Mamillaria gabbii  Engelm Mss。

Globose; 5 to 10 cm。 in diameter; simple: tubercles cylindrical; slender; 12 to 14 mm。 long; with woolly axils: radial spines about 13; 5 to 8 mm。 long; lower ones longer and stouter; especially the lateral ones pectinate; the central shorter; straight; and robust: flowers small; yellowish…red: fruit unknown。  Type in Herb。 Mo。 Bot。 Gard。

Among rocks; from San Ignacio to Mission San Fernando; Lower California; and 〃perhaps farther north in the interior。〃

Specimens examined: Lower California (W。 M。 Gabb 19 of 1867)。

35。 Cactus sphaericus  (Dietr。) Kuntze; Rev。 Gen Pl。 261 (1891)。

  Mamillaria sphaerica  Dietr。 Allg。 Gart。 Zeit xxi。 94 (1853)。

Obovate or clavate; 5 cm。 or more high; proliferous and at length densely cespitose: tubercles elongated…ovate; acutish; 12 to 10 mm。 long with axillary wool: radial spines 12 to 14; setaceous; 7 to 9 mm。 long; bulbous at base; straight or curved; white; central spine straight; subulate; somewhat shorter; but scarcely stouter: flowers yellow; 3。5 to 5 cm。 long: fruit unknown。  Type unknown。

Sandy ridges in the valley of the Rio Grande (both sides of the river); from the mouth to Eagle Pass。  Fl。 from March throughout the season。

Specimens examined: Texas (Schott of 1852): also specimens cultivated in St。 Louis in 1845 and 1861。

Dietrich's description was taken from plants collected by Poselger at Corpus Christi。  The Schott specimens are from Eagle Pass。  Dr。 Engelmann calls attention to the fact that this species approaches Coryphantha in its exserted ovary and large flower; but the flowers are clearly from the growth of the preceding season。  The species is said to be too near the Mexican C。 longimamma of central and southern Mexico; but in the absence of type specimens of either the question can not be settled。 The usual characterization of C。 longimamma is as follows; which seems to make it distinct enough:

36。 Cactus longimamma  (DC。) Kuntze; Rev。 Gen。 Pl。 260 (1891)。

  Mamillaria longimamma  DC。 Rev。 Cact。 113 (1829)。

Ovate or at length cylindrical; simple or cespitose: tubercles oblong…ovate; large at base; 4 to 5 cm。 long: radial spines 7 or 8; radiant and equal; 8 to 10 mm。 long or more; more or less pubescent; central spines 1 to 3; somewhat longer and spreading: flower 4 cm。 long; becoming 6 cm。 broad when fully expanded; yellow。  (Ill。 DC。 Mem。 Cact。 t。 5。)

II。 CORYPHANTHA。 Flowers from the base of a groove on young or nascent tubercles (hence appearing terminal); mostly large: spines never hooked (except in the doubtful C。 brunneus)。

  * Flowers yellow。   + The originally central flowers pushed aside by the continuous     development of new tubercles: usually a single prominent      central spine。

37。 Cactus missouriensis (Sweet) Kuntze; Rev。 Gen。 Pl。 259     (1891)。

  Cactus mamillaris  Nutt。 Gen。 i。 295 (1818); not Linn。 (1753)。   Mamillaria missouriensis  Sweet; Hort。 Brit。 171 (1827)。   Mamillaria simplex  Torr。 & Gray; Fl。 N。 Am。 i。 553 (1840)。   Mamillaria nuttallii  Engelm。 Pl。 Fendl。 49 (1849)。    Mamillaria notesteinii  Britton; Bull。 Torr。 Bot。 Club; xviii;      367 (1891)。

Globose; 3。5 cm。 in diameter; simple or nearly so: tubercles ovate…cylindrical; 12 to 14 mm。 long; slightly grooved: radial spines 13 to 17; straight; whitish; setaceous; somewhat unequa

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