ECHINOPSIS. 



61 



Key to Species continued. 



Stems globular or thicker than long or sometimes clavate, never slender. 

 Flowers red. 



Flower-tube distinctly enlarged above, its scales distant, large 6. E. multiplex 



Flower-tube slender, nearly cylindric, its scales numerous, small 7. E. oxygona 



Flowers white. 



Inner perianth-segments acuminate. 

 Spines very short or none. 



Areoles nearly spineless 8. E. eyriesii 



Areoles with several spines, 4 to 7 mm. long 9. E. turbinala 



Spines subulate, 10 to 12 mm. long 10. E. tubiflora 



Inner perianth-segments not acuminate. 



Spines becoming white 11. E. albispinasa 



Spines yellow to gray or brown. 



Inner perianth-segments obtuse 12. E. silvestrii 



Inner perianth-segments acute. 



Plant small, 9 cm. in diameter or less; flower 16 cm. long 13. E. calochlora 



Plant 4 to 5 dm. high, 3 to 3.5 dm. thick; flower 20 to 22 cm. long. .14. E. cordobensis 

 CC. Spines more or less curved. 



Spines very delicate, central one hooked 15. E. ancistrophora 



Spines stout. 



Central spine solitary. 

 Radial spines straight. 



Plant about 9 cm. thick, 3 dm. high or less 16. E. spegazziniana 



Plant up to 1.5 meters high, 16 to 18 cm. in diameter 17. E. shafcri 



Radial spines curved. 



Ribs strongly crenate 18. E. fiebrigii 



Ribs not strongly crenate. 



Flowers 15 cm. long or less 19. E. rhodotricha 



Flowers 20 cm. long or more. 



Central spine up to 10 cm. long 20. E. leucanlha 



Central spine about 2.5 cm. long 21. E. obrepanda 



Central spines several. 



Ribs 16; spines at first rose 22. E. intricatissima 



Ribs 13 or 14; spines gray to blackish. 



Flowers straight 23. E. molesla 



Flowers curved 24. E. baldiana 



BB. Flowers yellow . . .25. E. aurea 



AA. Tube of perianth not longer than limb. 



Ribs not undulate 26. E. bridgesii 



Ribs undulate ..27.fi. mamillosa 



AAA. Species not grouped 28. E. formosa 



1. Echinopsis meyeri Heese, Gartenflora 56: 1. 1907. 



Stems globose or somewhat depressed at apex, 10 cm. in diameter, pale green; ribs 14 to 16, 

 acute, usually straight; spines subulate, all straight, rosy below, brown or black above, but in age 

 nearly white; radial spines 7 or 8; central spine solitary; flowers numerous, lateral, 15 to 20 cm. long; 

 all perianth-segments long, threadlike, twisted, the outer ones brownish, the inner dull white; axils 

 of scales on ovary and flower-tube bearing many long hairs ; stigma-lobes cream-colored. 



Type locality: Paraguay. 



Distribution: Paraguay. 



We have not seen specimens of this species, but the type was illustrated; so far as we 

 know it is not in cultivation. This should not be confused with the Echinopsis meyeri 

 which is grown in gardens and which, according to Berger, is a hybrid between E. eyriesii 

 and E. leucantha. 



This plant is remarkable among cacti for its very narrow perianth-segments. 



Haage and Schmidt offer a plant under this name for sale. It suckers very freely, 

 both on the side and near the top of the plant and these begin to send out roots while still 

 attached to the parent plant. They are covered with short brown spines. We do not 

 know the origin of Haage and Schmidt's consignment and we have seen only very small 

 plants from it. As these all show several central spines, while the E. meyeri Heese is 

 known to have a single central spine, there may be doubt as to their identification. 



Illustration: Gartenflora 56: pi. 1558. 



Figure 80 is from a photographic copy of the illustration above cited. 



