155 



ing of the tube, but this throws /'. tuberosa and />'. geminijfora into the same subgroup. 



As I understand the genus, it is composed of 9 or 10 species. 



Prochnyanth.es Wats. Proc. Am. Acad. 22 : 457. 1887. FIGURE 11. 



Typo of genus, P. viridewens Wats., 1. c. 



This geuus was established by Dr. Sereno Watson in 18K7 upon plants brought 

 back by Dr. Edward Palmer from near Guadalajara. The species has been sup- 



FiG, 12. — Flower of Manfreda vinjinica. 



Fro. 11. — Flowers of Prochnyanthes viridescens, 

 natural size. 



posed to be known only from this region. I found 

 it to be very common, however, in the Sierra 

 Madre, and specimens were 

 brought back from the Terri- 

 torio de Tepic and the States 

 of Durango, Zacatecas, and 

 Jalisco. These specimens 



show considerable departures from the type, but I have been com- 

 pelled to consider them all as forms of a widely varying species. 

 Living specimens were brought home, and these are the lirst 

 which have been reported in cultivation. 



Pseudobravoa Rose, gen. nov, Plate XVIII. 



Type, Bravoa demijtora Robinson & Fernald, Proc. Am. Acad. 30 : 

 122. 1894. 



The genus differs from Bravoa and Polianthes in its short, dense 

 spike of flowers, which arc solitary in the axils of lung-attenuate 

 bracts. The flowers are yellow, very long funnel form, at, first 

 erect, becoming somewhat curved, but never abruptly bent or 

 abruptly dilated. Stamens inserted high up in 

 thetubej anthers included. Low, nearly acaules* 

 cent plants with loosely coated bulbs, the root- 

 stocks very small or wanting. The only species 

 is Pseudobravoa densiflora (Robinson &, Fernald). 

 Manfreda Salisb. Gen. PI. Fragm. 78. 1866. 



Figures 12 to 14. 

 Type of the genus, Manfreda virginica (L.) Salisb. 1. c. Agave 

 virginica L. Sp. PI. 1 : 823. 1753. 



This genus was established by Salisbury in 1866, but has never 

 come into use. There has been, however, a quite general agree- 

 ment that these species form a very unique section of Agave. Baker says, in speak- 

 ing of Manfreda: "These form a very distinct group, worthy, 1 think, of separation 



l\ 



Fio. 13.— Manfreda 



seedling, natural 

 size. 



FlG. 14.— Manfreda 

 bulb, cross-sec- 

 lion— scale of '3. 



