30 THE GENUS PHOKADENDRON 



Fruiting spikes elongated (60-70 mm.) with separated 

 whorls of berries. P. macrotomum. 



Leaves narrower, subspatulate : slender. P. Eatoni. 



Staminate spikes mostly stouter and longer, the rather many-flow- 

 ered joints 6-15 mm. long. Southwestern, Pacific or Mexican. 

 Spikes canescently tomentose. 



Staminate spikes moderate (15-20 mm.). Texan. 



P. Engelmanni. 

 Staminate spikes long (40-60 mm.). North Mexican. 



P. Greggii. 



Spikes short. East Mexican. P. thyrsoideum. 



Spikes yellow-hispid, moderate. East Mexican. P. colipense. 

 Spikes glabrous or sparsely villous. 



Leaves rounded. P. macro pJiyllum. 



Leaves oblanceolate. 



Flowers large. New Mexican. P. Cockerellii. 



Flowers moderate. Desert. P. coloradense. 



Spikes rather canescently short-villous. Californian. 



P. longispicum. 



Staminate spikes short, the few-flowered short-villous joints scarcely 

 5 mm. long : fruit somewhat villous. 



Short-villous. Californian. P. villosum. 



Velvety-tomentose. Mexican. P. tomentosum. 



Minutely rusty-pubescent. Mexican. P. puberulum. 



Berries small (3 mm.), pubescent above, with sepals scarcely one-third 



mm. long : leaves prevailingly rounded. Southwestern. 



Leaves moderate (often 25x30 mm.). P. Coryae. 



Leaves small (10x15-20 mm.). 



Spikes closely tomentose. Texan. P. Havardianum. 



Spikes slightly villous. North Mexican. P. Wilkinsoni. 



PHORADENDRON FLAVESCENS Nuttall. 



Plioradendron fiavescens Nuttall, Journ. Acad. Philadelphia, n. s. vol. 1. 



p. 185. 1847. v. Ettingshausen, Denkschr. Akad. Wien. vol. 32. 



pt. 1. pi. 2. Britton & Brown, 111. Fl. vol. 1. f . 1272. Amer. Journ. 



Pharm. vol. 55. p. 421. f. Coulter, Barnes & Cowles, Text Book. 



vol. 2. f . 1084. Garman, Bull. Ky. Agr. Exper. Sta. no. 169. f . 12. 



Bailey, Cycl. Am. Hort. 4 ed. 4 :1312. f . 1766. 

 P. flavescens glabriusculum Engelmann, Boston Journ. Nat. Hist. vol. 6. 



p. 212. 1850. 

 Viscum flavescens Pursh, Fl. Am. Sept. vol. 1. p. 114. 1814. de Can- 



dolle, Prodromus. vol. 4. p. 280. 

 V. leucarpum Rafinesque, Fl. Ludov. p. 79. 1817. 

 V. leucocarpum de Candolle, Prodromus. vol. 4. p. 280. 1830. 

 V. serotinum Rafinesque, New Fl. N. Amer. vol. 3. p. 22. 1836. 

 V. ochroleucum Rafinesque, 1. c. p. 23. 1836. 



