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TRANS. OF THE ACAD. OF SCIENCE. 



slightly ciliate; 18-21 petals, rose red, with a deeper colored 

 streak, lance-linear, shorter and narrower than the inner 

 sepals, entire; stamens not half as long- as petals, with oval 

 anthers ; style much longer than stamens, with 5-6 short, 

 greenish yellow suberect stigmas. 



MamiUaria tricolor, Lehui., is not a Texan plant, as has 

 been stated, inadvertently, in Synops. p. 7. Dr. Poselger 

 found it on another Rio Grande, between Tampico and Real 

 del Monte, Mex. 



MamiUaria papyracantha, Eng., is an Echinocactns, as 

 stated above. 



MamiUaria rectervispina, Eng., in Cact. Mex. Bound., p. 

 12; Syn. p. 10. As there is already a species named thus 

 by Vriese, (see Walp. Rep. 2, p. 301,) I now name the Ari- 

 zona species M. recurvata. M recurva, Lehm., is a form of 

 M. macracantha, D.C., tide Salm. 



Cereus variabilis, thus named in Cact. Mex. Bound., p. 40 

 t. GO, f. 5-6, and in Synops. p. 31, is not Pfeiffer's plant, 

 figured in Abbild. 2, t, 15, but seems to be, as regards fruit 

 and seeds, identical with a species obtained by Dr. Poselger 

 near Tampico, and decided by him to be C. 2?rinceps, Hurt. 

 Wtirzb. ex-Pfeiff. Enum. p. 108. Plants from the Rio Grande 

 have repeatedly bloomed here at the late Mr. Grieve's, and 

 as the flower has never been described, I here supply the 

 omission. Fruit and seed, obtained near Matamoras, have 

 been described and figured in Mex. Bound. Cact. 1. c. 



Flores ad apicem caulis ramorumve pauci magni albi noc- 

 turia; ovario ovato areolis aculeolatis 25-30 stipato; tubo 

 elongato cylindrico sursum sensim ampliato areolis 16-20 vix 

 squamigeris, inferioribus aculeolatis munito; sepalis superi- 

 oribus 20-25 lanceolatis patulis reflexisve ; petalis 40-50 

 pluriseriatis lineari-lanceolatis patentissimis; staminibus su- 

 periori tubi parti gradatim adnatis; stigmatibus 12-13 in 

 capitulum clavato-obovatum coarctatis pallide vircscentibus. 



In bloom from July to September, flower 7-8 inches 

 long, 5£-6 inches wide ; tube 4-5 inches long; lower sepals 

 near the well defined upper edge of the tube reddish green, 

 3-9 lines, upper ones petaloid, 9-18 1. long; petals 2 inches 

 long, and about 4 1. wide; lower part of tube for 2 or 2£ 

 inches, with a naked, nectariferous surface; the upper part, 

 2^-3 inches, densely beset with stamens of about equal length, 

 so that the mass of the anthers form a deep funnel, corres- 

 ponding to the shape of the upper part of the tube; the outer 

 series of stamens forms a regular crown, but is not separated 

 from the inner lower ones by a naked belt, such as is found 

 in many species; nor are the filaments declined, and, so to 

 say, fasciculated. This is interesting, as it weakens the value 

 of this arrangement of stamens as a generic or subgeneric 

 character; nevertheless, it is one of the few general charac- 



