BOREALES BRACHYSTACHYAE 45 



4. BRACHYSTACHYAE. 



Leaves usually relatively narrow, never greatly elongated or large. 

 Shoots neither angled nor as a rule compressed. Mexico. 



Persistently woolly. P. lanatum. 



Pubescence usually sparing and evanescent. 

 Fruit villous or hispid. 



Leaves elongated. Chiefly East Mexican. 



Fruit retrorsely hispid : sepals meeting. P. Galeottii. 



Fruit sparsely villous. 



Sepals not meeting. East Mexican. P. Palmeri. 



Sepals meeting. Lower Californian. P. peninsulare. 

 Leaves broad. Lower Californian. P. Eduardi. 



Fruit glabrous or short-hairy. 



Leaves sessile, subacute. P. mazatlanum. 



Leaves mostly petioled, very obtuse. 

 Ample species, of the mainland. 



Evanescently hispid, varnished. P. brachystachyum. 

 Densely short-villous : leaves petioled. P. tlacolulense. 

 Sparingly villous : leaves sessile. P. globuliferum. 



Rather small species, of Lower California. 



Leaves round-obovate, subpetioled. P. aureum. 



Leaves oblong-obovate, sessile. P. brachyphyllum. 



Leaves spatulate-oblanceolate. 

 Attenuate base short. 



Spikes rather long (20-30 mm.). P. tumidum. 

 Spikes short (15 mm.). P. Diguetii. 



Subpetiolate contraction marked. 



Spikes slender, tomentose. P. peninsulare. 

 Spikes stout, glabrate. P. saccatum. 



Phoradendron lanatum n. sp. 



Not forked but more or less pseudodichotomous from the falling of 

 one lateral branch at a node, the rather long and slender branches with- 

 out cataphyls, dioecious?. Internodes rather short (3x20-30 mm.), 

 densely and persistently woolly with long sulphur-yellow hairs like the 

 foliage. Leaves narrowly elliptical varying into subspatulate or obovatc, 

 subacute to very obtuse, .5-.8x2-3 cm., contracted for about 1 mm. at base. 

 Spikes (young) solitary, short (10 mm.), very tomentose, with 2-4 short 

 few-flowered joints: peduncle scarcely 1 mm. long: scales concealed by 

 long hairs. Fruit subglobose, 4 mm. in diameter, slightly villous at top : 

 sepals nearly glabrous, closely inflexed. Plate 46. 



Cordilleran region. The type from central Mexico. 



Specimens examined: MEXICO. Mesa de Cascomate, Oaxaca (Pur- 

 pus, 2724, 1907). Hacienda Ciervo y Cadereyta, Queretaro (Rose, Paint- 

 er & Rose, 9707, the type) . 



