STANDLEY TEEES AND SHRUBS OF MEXICO. 949 



5 cm. long, fleshy, edible, dark brown to drab-colored ; seeds pitted. " Biznaga 

 de tuna" (Tamaulipas) ; "biznaga de limilla " (Nuevo Leon); '* limilla," 

 "biznaga costillona," "biznaga espinosa," "biznaga gancliuda " (Durango, 

 Patoni). 



Safford reports that in Nuevo Leon the fruit is used in cooking as a substi- 

 tute for lemons. 



28. Ferocactus uncinatus (Galeotti) Britt. & Rose, Cactaceae 3: 146. 1922. 

 Echinocactus uncinatus Galeotti; Pfeiff. Abbild. Beschr. Cact. 2: pi. IS. 1848. 

 Echinocactus ancyl acanthus Monville ; Labour. Monogr. Cact..201. 1853. 

 Central and eastern Mexico. Western Texas. 



Plant short-cylindric, 10 to 20 cm. high, bluish, slightly glaucous, with spin- 

 dle-shaped roots ; ribs usually 13. straight, strongly tubercled, undulate ; flower- 

 ing areoles narrow, extending from the spine clusters to the base of the 

 tubercles with the flower at the opposite end, felted ; areoles also bearing one 

 or more large flat yellow glands, these surrounded by a ring of short yel- 

 low hairs ; central spine usually solitary, 12 cm. long or less, erect, yellow 

 below, reddish above, hooked at tip ; 3 lower radial spines spreading or 

 reflexed, hooked ; upper radials straight ; flowers brownish, 2 to 2.5 cm. long, 

 widely spreading ; perianth segments numerous, linear-oblong ; scales on ovary 

 and flower tube triangular, scarious-margined, in age broadly auriculate at 

 base ; fruit oblong, 2 cm. long, at first green, turning brown to crimson and 

 finally scarlet, naked except the appressed scales, somewhat fleshy, edible; 

 seeds black, oblong, 1 to 1.5 mm. long, with basal hilum. 



29. Ferocactus rostii Britt. «& Rose, Cactaceae 3: 146. 1922. 

 Northern Baja California. Southeastern California. 



Sometimes growing in clumps of 8 to 10 heads but usually slender-cylindric, 

 up to 3 meters high; ribs 16 to 22, rather low (hardly 1 cm. high), obtuse, 

 somewhat tubercled ; areoles large, white-felted, approximate ; spine clusters 

 closely set, the spines interlocking and almost hiding the body of the plant ; 

 radial bristles sometimes wanting but when present 2 to 8, white or yel- 

 lowish ; spines about 12, sometimes fewer, 3 or 4 central, those on the lower 

 part of the plant more or less spreading, those at or near the top erect, some- 

 what flexible, flattened, annulate, pungent, either straight or curved at apex, 

 perhaps never hooked, usually yellow but sometimes reddish on young plants 

 but also turning yellow in age ; flowers dark yellow ; fruit red. 



DOUBTFUL SPECIES. 



The following are perhaps of this genus : 

 Echinocactus haematacanthus Monville ; Weber, Diet. Hort. Bois 466. 1896. 



Reported from Puebla. 



Simple, sometimes perhaps proliferous, short-cylindric, 50 cm. high, 30 cm. 

 in d'ameter; ribs 12 to 20, stout, light green; spines all straight, reddish 

 with yellowisli tips, the radials 6, the centrals 4, 3 to 6 cm. long ; flowers f un- 

 nelform, 6 cm. long, purple; scales of ovary round, white-margined; fruit 

 ovoid, 3 cm. long. 

 Echinocactus rafaelensis Purpus, Monatsschr. Kakteenk, 22: 163. 1912. 



Type from Minas de San Rafael, San Luis Potosl. 



In clusters of 8 to 10, globose to short-cylindric, light green, at the apex 

 slightly depressed and woolly; ribs 13 to 20, prominent; areoles elliptic; 

 radial spines 7 to 9, 3 cm. long, the upper ones somewhat connivent ; central 

 spine solitary, 4 to 6 cm. long. 

 79688—24 8 



