1898 ] FLORA*OF LOWER SONORAN AND ARID ZONES 125 
MALVACE. 
Three genera, Spheralcea, Malvastrum, and Sida, furnish 
good illustrations for our purpose. They are pronounced 
xerophytic genera, and have this noteworthy feature in com- 
mon, that they occur in the Lower Sonoran zone, in the South 
American arid regions, and either in the Capland or in Australia.® 
In Malvastrum, while the type of the three regions (Sonoran 
zone, Argentine-Chili, etc., Capland) appears to be a common 
one, there occurs in the Andes of Chili and Peru the very dis- 
tinct section Phyllanthophora described by Professor Schumann’ 
as follows: 
In Chili, und dem Andinen Gebiete iiberhaupt steigen die Arten der 
Gattung M. hoch in die Gebirge und nehmen einen durchaus alpinen Char- 
acter an; sie sind durch niedrigen, dicht rasigen Wuchs mit rosettig 
gedringten Grundbl. und starke graue Bekleidung ausgezeichnet. Diese 
Formen haben stets Bl., welche an den Tra gblattern emporgehoben sind, 
und aus dem Stiele derselben hervorbrechen. Sie bilden die einzige wohl 
abgegrenzte Gruppe, die Asa Gray als Phyllanthophora bezeichnet hat. 
In this connection the distribution of several species of Sida® 
is of interest, as follows: 
Sida leprosa K. Schumann (Malva leprosa Ortega; Sida hederacea Torr.). 
—Uruguay, Patagonia, Argentine, Cuba, Mexico, Washington to southern 
California, Utah, Arizona, and W. Texas. 
Sida hastata St. Hil. (S. physocalyx Gray).—Argentine, Uruguay, Mexico, 
Texas to Arizona. 
Sida anomaila St. Hil. (S. fasciculata T. & G.)—Matto Grosso, Uruguay, 
Argentine, Bolivia, Cuba, Florida, Texas, Mexico. 
° Sphzeralcea, four species in Capland; Malvastrum, fifteen —— in Capland ; 
Sida, seventeen species indigenous to Australia (see Pfanzenfamilien 3°:—). Com- 
are in this connection ipeageas and Frankenia. 
? ’ Pilanzenfamilien 3° aes A ; 
This is being nue ene here the “ Gulf zone distribution.” Other illustrations 
are eee ing : 
tenfugosia sulphurea Garcke (Fugosia Drummondii Gray). 
Tens athe southern Brazil, Paraguay. ek 
he ; 2. Spergularia Plattensis fei Dallas, Texas, to southern California and so 
Southwes, 
+ etegpegae spathulatum Ell, Southern California, Georgia, Texas, Sonorat 
Chili, Uruguay, Montevideo. 
4. Polygala falidics St, Hil. Brazil, Paraguay, Louisiana, Texas. 
