CEPHALOCEREUS. 59 



This species, recognized by Schumann as a good species of Pilocercus, we do not know. 

 Its flowers and fruits are unknown and hence its exact place can not be determined. Its 

 origin, too, is unknown and so far as we are aware it is not now in cultivation. The above 

 description has been compiled. 



Pilocereus glaucescens Labouret, Monogr. Cact. 279. 1853. 



Pilocercus coerulescens Lemaire, Rev. Hort. 1862: 427. 1862. 



Pilocercus andryanus Cels in Lemaire, Rev. Hort. 1862: 427. 1862, as synonym. 



"Stem erect, at first simple, later probably becoming branched, dark bluish gray, glaucescent, 

 bearing 10 rounded, blunt, inflated ribs; sinuses sharp, shallow, with age becoming effaced toward 

 the base of the stem; areoles close together, almost confluent toward the base of the stem, rounded, 

 with short almost black tomentum, furnished with hairs and very abundant, fine, undulating, weak, 

 white bristles, especially on the areoles recently developed and toward the summit of the stem, 

 rarer on the lower areoles; spines radiating, of different lengths and thicknesses, biserial, the exterior 

 fine, divergent, inserted to the number of 5 or 6 on each side of the areole, the interior stouter, dis- 

 posed irregularly in the center, to the number of 5 or 6 also, all of a dull yellow, brown at the base. 

 The plant is 8 cm. in diameter by about 20 cm. in height ; the bristles and the hairs of the areoles are 

 about 1 to 2 cm. long; the interior spines, which are the strongest, are 10 to 15 mm. long; flowers 

 unknown. 



"The general aspect of this plant, which I believe is unique in Europe, resembles that of a 

 Pilocereus. However, in the absence of definite and certain characters, it is not without doubt that 

 we place it in the genus near Pilocereus columna and chrysomalus, as much for the long bristles of its 

 areoles as for its branching stem. If later, however, its flower makes it a Cereus, its place would 

 very probably be among the Lanuginosi, just after the Coerulescenles, and in th is event, which seems 

 doubtful to me because of its many points of resemblance to Pilocereus, it would certainly constitute 

 one of the most remarkable species of Cerei." 



The above is taken from Labouret's monograph. 



The Index Kewensis refers one of these names to Cereus glaucescens and the other to Cereus 

 coerulescens, but doubtless in error, while the last is called Cereus andryanus by Schumann 

 (Gesamtb. Kakteen 196). Lemaire says his plant came from Serra do Cipo, District 

 Diamartina, Brazil. 



Pilocereus albispinus (Salm-Dyck) Rumpler in Forster, Handb. Cact. ed. 2. 649. 1885. 



Cereus albispinus Salm-Dyek, Observ. Bot. 3: 5. 1822. 



Cereus crenatus Salm-Dyck in Labouret, Monogr. Cact. 341. 1853. 



Pilocereus albispinus crenatus Rumpler in Forster, Handb. Cact. ed. 2. 649. 1885. 



Cereus serpentinus albispinus Weingart, Monatsschr. Kakteenk. 18: 30. 1908. 



Columnar, usually simple but sometimes branched at base; branches with 8 to 12 low, obtuse 

 ribs, these dull green and woolly at apex; radial spines 8 to 13, spreading, white except at tip and 

 there red; central spines 1 to 4; flowers and fruit not known. 



Type locality: Curacao, according to Schumann, but nothing like it was found there 

 by Dr. Britton in 1913. 



Distribution: Unknown. Rumpler says it is South America. 



Cereus albispinus major Monville (Labouret, Monogr. Cact. 341. 1853) is undescribed. 



The original publication of Cereus acromelas (Hortus, Berol. Ind. Cact. 1833) we have 

 not seen. Pfeiffer refers it to Cereus crenulatus and Labouret to C. albispinus. 



Cereus octogonus Otto (Allg. Gartenz. 1: 365. 1833) an d C. decagonus (Pfeiffer, Enum. 

 Cact. 85. 1837) are unpublished names for this species. 



We have studied a living specimen of this plant which is growing in the New York 

 Botanical Garden. Its flowers and fruit are not known. See note under Cephalocereus 

 leucostele; see also Weingart's reference (Monatsschr. Kakteenk. 18:30. 1908). 



