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Botanical Gazette 
A Montbly Journal Embracing all Departments of Botanical Science 
Subscription per year, $4.00 Single Numbers, 40 Cents 
The subscription price must be paid in advance. No numbers are sent oe the expiration 
of the time paid for. No reduction is made to dealers or agen 
r FOREIGN AGENTS: 
a | 
Great Britain — WM. WESLEY & Son, 28 Essex Germany — GEBRUDER BORNTRAEGER, Berlin 
St., Strand, London. 18 Shillings. SW. 46, Schénebergerstr. 17a. 18 Marks 
Vol. XXXII, No. 1 Issued July 24, 1903 
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: 
CONTENTS 
ON THE ORIGIN AND NATURE OF THE MIDDLE LAMELLA. Charles E. Allen - I 
STRUCTURAL STUDIES ON SOUTHWESTERN CACTACEAE (WITH NINE FIGURES). 
Carleton E. Preston - : s E ss ‘ : es 3 m : é “ 35 
BRIEFER ARTICLES. 
NOTE ON BASILIMA AND SCHIZONOTUS OF RAFINESQUE. Alfred Rehder - - - 56 
POTAMOGETON POLYGONIFOLIUS IN NEWFOUNDLAND. Arthur Bennett : : = 58 
A SPHAERALCEA. 7. D. A. Cockerell - x : : 2 : : . m 60 
Ci morse nf at noes TURE. 
k = 61 
NDBOOK OF bitineceie Sickie: 
MINOR NOTICES i : : = ‘ i “i 62 
NOTES FOR STUDENTS - - z 2 ‘ : = 2 63 
NEWS - - - we ean : z 3 . “ . 74 
Separates, if de: 
ing articles will be pris ted, of which 25 eink coe) will be furnished peo the actual cost of the 
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Chi TH Tcl; 
i] matter. ] 
