BARTLETT. — THE PURPLE-FLOWERED ANDROCERAE, 627 
VII. THE PURPLE-FLOWERED ANDROCERAE OF MEXICO 
AND THE SOUTHERN UNITED STATES. 
By Harter, Harris BAartTuert. 
The Mexican Solanums of the sub-genus Androcera divide naturally 
into two sections, one of which is characterized by purple or white 
flowers and the lack of stellate pubescence except on the leaves, the 
other by yellow flowers and extreme development of stellate pu 
cence on all parts of the plant. In the only apparent exception to 
this grouping, Solanum macroscolum Fernald, the flowers are tinged 
with purple, but the basal color, over which the purple is suffused, is 
yellow. The pubescence is that of the second section, to which the 
plant evidently belongs. All of the species of the first section, with 
the single exception of S. Grayi Rose, which has white flowers, are 
purple-flowered. Those in the Gray Herbarium may be determined by 
the following key: 
Anthers of two kinds; four subequal and straight, the fifth longer and curved. 
1 em. long or less. 
Pubescence and spines of young fruiting calyx olive-green. 
S. heterodorum. 
Pubescence and spines of young fruiting calyx golden-brown. 
S. heterodoxw 
icanum. 
Corolla about 2 em. long. 
Pedicels stout, about as long as the fruiting calyx. F 
Spines on stem scattered, separa rom one another by i own 
Pe A eet oS ifolium. 
ength. 
Stem densely bristly with slightly reflexed spines. 
S. citrullijolium var. setigerum. 
Pedicels slender, longer than fruiting calyx. . - ..-- - S. tenuipes. 
Anthers of three kinds, two short and straight, two longer and curved, form- 
Ing a, transition to the still longer and more curv ; 
S. Lumholizianum. 
SoLANUM HETERODOXUM Duval. Caulis sparsim vel dense aculea- 
tus, pilosus vel in parte inferiore subglaber, pilis apice glanduliferis. 
Folia petiolata sub-bipinnatifida, partibus 5-7 oppositis, utrinque 
aculeata, supra glabra vel pilis paucis simplicibus conspersa, subtus 
-&t pilis stellatis et simplicibus tecta. Pedunculus 35cm. longus. 
Be = --Pedicelli 8-12 mm. longi crassiusculi aculeati glanduloso-pilosi. Flores 
