OF MARINE COASTS. 121 



POLYGONACEAE. 



Chorizardhe pungens Benth. 



Annual, with prostrate branches, 5 — 30 cm. long; leaves spatulate, 

 1 — 3 cm. long, opposite, petioles of cauline leaves .10 mm. long, those 

 of the radical 25 mm. 



Sand hills on Californian coast, from San Francisco to Monterey Bay. 



Eriogonum latifolium Smith. 



Perennial herb, stout, tomentose, the indurated caudex with short 

 leafy branches; leaves 2 — 5 cm. long, oblong to ovate, obtuse or acute 

 at apex, rounded or cordate at base, margin often undulate, upper 

 surface glabrate, densely woolly beneath; petioles often margined. 



Sand formations along California coast, occasionally together with 

 other species of the genus. 



Muehlenbeckia adpressa Meissn. 



Stem woody at base, prostrate or climbing; leaves petiolate, lance- 

 olate or hastate; obtuse, 2 — 7 cm. long, margins crisped, glabrous; 

 flowers small, green. 



On the sea coast of Tasmania, Victoria, South Australia, and West 

 Australia (Fremantle). 



M. complexa Meissn. is a species occasionally occurring on sea beach- 

 es of North Cape, New Zealand. 



Polygonum aviculare L. 



Annual herb, prostrate, with branches leafy to the end, glabrous 

 and green, stems wiry, minutely striate, sometimes meterlong; leaves 

 oblong, acute, 1 — 2 cm. long, shortly petiolate. 



Almost everywhere on the globe, especially in temperate climates. 



Very variable, especially on sea shores, where a number of forms 

 occur, as yet insufficiently known. 



P maritimum L. 

 Perennial, somewhat woody; branches short, thick; leaves glaucous, 

 thick, larger than in P. aviculare, which it resembles, especially when 

 young. 



P. Rayi Bab. 

 is a nearly related form, differing only in the fruits. 



The distribution of these forms ' is not well known, but they are 

 found in a number of widely separated localities. 



Ldbrary Publication*. 8 



