APOROCACTUS. 219 



tube and with nearly erect filaments ; the stem is weak and creeping, with about 6 angles ; 

 it is somewhat stouter than is A porocactus flagelliformis. Cercus mall-isonii* (Pfeiffer, Enum. 

 Cact. in. 1837), C. flagelliformis mallisonii (Walpers, Repert. Bot. 2: 278. 1843), and 

 C. flagelliformis smithii (Walpers, Repert. Bot. 2: 278. 1843) are other names for this same 

 hybrid and this must also be C. flagelliformis speciosus Salm-Dyck (Cact. Hort. Dyck. 

 1849. 50. 1850) since it is based on the same illustration. While botanists generally refer 

 the name, as we have above, to Pfeiffer, it was fully described and figured by Link and Otto 

 (Verh. Ver. Beford. Gartenb. 12: 134. pi. i. 1837). While they announce that their plant 

 was obtained by Mallison, as we state above, their illustration shows a very different 

 flower from the one figured in the Botanical Register and suggests that it was from a 

 different plant, although doubtless produced from the same parents. The flower differs 

 from the other not only in its color but also in its narrower, more elongated tube. Cereus 

 crimsonii (Pritzel, Icones 246. 1855) was also based on the plate in the Botanical Register 

 (19: pi. 1565. 1833) and must represent this same hybrid. 



Cereus aurora (Monatsschr. Kakteenk. 16:81. 1906) is also of hybrid origin. Accord- 

 ing to E. Golz, one of its parents is some species of Echinopsis. 



Cereus ruferi and C. ru/eri major (Monatsschr. Kakteenk. 16: 10. 1906) are said to be 

 hybrids of which C. flagelliformis is one of the parents. 



Cereus moennighoffii Fischer (Monatsschr. Kakteenk. 15: 143. 1905) is a hybrid 

 between this species and C. martianus. Other hybrids with Cereus martianus and Epi- 

 pJiyllum ackermannii have been reported. 



Cereus vulcan (Monatsschr. Kakteenk. 16: 10. 1906) is a hybrid of A. flagelliformis; its 

 other parent is unknown. It is illustrated by Rumpler (Sukkulenten f. 67). 



There are several unpublished names which are referred to this species, among which 

 are varieties funkii, twthus, scotii, and smithii, all in Walpers (Repert. Bot. 2: 278. 1843). 



Illustrations: Safford, Ann. Rep. Smiths. Inst. 1908: f. 18; Stand. Cycl. Hort. Bailey 

 i: f. 237. Curtis's Bot. Mag. i: pi. 17; De Candolle, PI. Succ. Hist. 2: pi. i27;DeTussac, 

 Fl. Antill. 2: pi. 28; Mag. Bot. and Card. Brit, and For. i : pi. 14, f. 4; Loudon, Encycl. PI. 

 f. 6875, as Cactus flagelliformis; Baillon, Hist. PI. 9: f. 52, 53; Cact. Journ. i: 10; Forster, 

 Handb. Cact. ed. 2. f. 5 ; Martius, Fl. Bras. 4 2 ' pi- 4i> ' 2 > au " as Cereus flagelliformis; Rump- 

 ler, Sukkulenten f. 66, as Cereus flagelliformis minor; Trew, PI. Select, pi. 30, as Cereus. 



Plate XL, figure 2, shows a flowering plant in the collection of the United States Depart- 

 ment of Agriculture. 



3. Aporocactus flagriformis (Zuccarini) Lemaire in Britton and Rose, Contr. U. S. Nat. Herb. 12: 



435- 1909- 



Cereus flagriformis Zuccarini in Pfeiffer, Et'um. Cact. in. 1837. 



At first erect and rather stout, afterwards creeping and very much branched; branches green, 

 10 to 24 mm. in diameter; ribs n, very low, obtuse, somewhat tuberculate; areoles small, 4 to 6 

 mm. apart; radial spines 6 to 8, 4 mm. long, acicular, horn-colored; central spines 4 or 5, shorter than 

 the radials but stouter, brown; flowers dark crimson, 10 cm. long, 7.5 cm. broad or more; flower- 

 tube 3 cm. long or more; perianth-segments in 3 series, the series well separated; inner perianth- 

 segments oblong, 10 mm. broad, acuminate; stamens red, erect, exserted; stigma-lobes 6, white. 



Type locality: San Jose de 1'Oro, Oaxaca, Mexico. 



Distribution: Mexico. 



This species seems not to have appeared in collections for a long time. As the type 

 locality is known one would suppose it might have been reintroduced. We have repeatedly 

 tried to have it re-collected but so far have failed ; in putting forth this effort we have suc- 

 ceeded in discovering another species which is described below as new. 



The binominal A. flagriformis appeared in Lemaire, Les Cactees, page 58, 1868, but 

 it is not formally published at that place. 



*Cactus mallisonii is credited by the Index Kewensis to London's Encyclopedia (Snppl. i. 1202. 1840), but it 

 appears there under Cereus. 



