OPUNTIA. 



79 



Dr. Rose observed a single plant infested by Loranihus aphyllus, the parasite which is 

 so abundant on Cereus chiloensis. 



/ 



Opuntia heteromorpha Philippi (Anal. Mus. Nac. Chile 1891^: 28. 1891) we refer here 

 on the authority of Schumann, but we have seen no specimens, the type specimen being 

 missing from the Philippi herbarium in Santiago; it was collected at Chiquito, Tarapaca, 



Chile. 



Dr. Weber thought that Opuntia segethii belonged here, but we have referred it to 



0. subulata. 



Opuntia carrizalensis Philippi is only mentioned by Schumann (Gesamtb. Kaktcen 



Nachtr. 152. 1903). It is doubtless to be referred here. 



Plate XVI, figure i, is from a plant collected by Dr. Rose at Vallenar, Chile, in 1914. 



Series 13. CLAVATAE. 



Here we include nine prostrate or spreading, low species, natives of the southwestern United 

 States and Mexico, characterized by clavate joints and by slieathless spines, although rudimentary 

 sheaths have been observed on young spines in some of the species; they appear to form a transition 

 between the subgenus Cylindropiintia and the South American subgenus Tcphrocadus, from which they 

 differ essentially in having clavate joints. 



Key to Species. 



1 



Spines flattened. 



Stems very stout. r /') ' ' / 



Stems hardly clavate; ovary very prickly 4"- ^- t^n'tda 



Stems stricUy clavate; ovary only slightly prickly 47- ^- ^lanlyi 



Stems more slender and weak. ^ 7 /,•• 



Spines brown, slender, long (4 to 6 cm. long) 4^- ^' ^c/wlln 



Spines stout, white, when old very flat. 



Bristles on ovary and fruit white 49- O- clavafa 



Bristles on ovary and fruit brown : • ^ 5o. U. parnhn 



Spines terete, elongated, and flexible, or the central ones somewhat flattened. 



Flowers pinkish or purple. 



Bristles on ovary numerous, brown ^^- ''' V^^^ 



Bristles on ovary few, white 52. u, luis 



Flowers yellow. ^^ ^ h,.ihi.h.i*tn 



Spines comparatively short, swollen at base 53- ^^. 3 J !^^« 



Spines long and flexible, not swollen at base 34- <^- gramimii 



51. O, pulchclla 



ascen 



46. Opuntia invicta Brandegee, Proc. Calif. Acad. II. 2: 163. 18S9. 



Plants growing in large clusters 2 meters in diameter and 2 to 5 dm. high, with many ^ 

 or spreading branches ; joints obovoid to clavate, dark green, 8 to 10 cm. long, strongly tuberculate; 

 tubercles large, flattened laterally, 3 to 4 cm. long; areoles large, i to 1.5 cm. in diameter; leaves 

 linear, 8 to 14 mm. long, reddish, curved, acute, deciduous; spines very formidable, when young 

 ,._ i ,. '. ^ i ... ^V . J 1 ^u«.-+*,,.+.Krr.«rn af t n<; and pravish between, but in age 



-r- 



reaaisn or purpie wiin carmme-icu ua=>co, vn^^uxxi^v, ^. r-- - <=» ^ - .^^„\' 



dull in color; radial spines 6 to lo; central spines lo to 12 much stouter than the ^^d^lS' strongly 

 flattened; wool white fglochids few, white. 2 to 4 mm. long; flowers yellow, 5 cm^m diameter .sepals 

 ovate, acuminate ; ov^ry 2 cm. in diameter, almost hidden by the numerous reddish, acicular spmes , 

 seeds yellowish, 2 mm. broad. 



Type locality: About San Juanico, Lower California. ^ 



Distribution: Central Lower Cahfornia, at low eievauons 

 Mr. Brandegee has called attention to the strong resemblance 



some 



some 



great tufted masses 



remotest degree any of our North American opuntias. The species 



clearly belongs to Hngelmann's series Clavatae, where it was placed by Schumann 



if 



So far 



as we know, the plant has never been in the trade ; it does not succeed well m cult, vafon 

 Considerable living material was brought back by the Albatross in :9n . most °f -h * wa 

 sent to the New York Botanical Garden ; but some of the plants were sent to collections at 

 St. Louis, Washington, and Los Angeles. 



Illustration: Cact. Joum. j: February. 



f 



> 



