(273 ) 
1. Platanus L. Sycamore. 
Only genus.— b. 
1. P. racemosa Nutt.—Common. Spring. 
Family 2. URTICACE. 
6 perigonium 4-lobed; stamens 4; fila- 
ments inflexed in s«stivation; anthers introrse, 
2-celled; ovary rudimentary. 2 perigonium 
2to 4-lobed; ovary 1-celled, l-ovulate; fruit 
an akene, sometimes baccate by the persistent 
and succulent perigonium. Stipules generally 
persistent. 
1. Urtica Tourn. NeEvrcrie. 
6 perigonium regular and spreading. 
perigonium 2-parted, with sessile, penicillate 
stigma. Herbs covered with stinging hairs. 
1. U. Hnoxossricea Nutt. Inflorescence uni- 
sexual; petioles short, stout.—2¢. Common. 
Summer. 
2. U. Lyartim Watson. Inflorescence uni- 
sexual; petioles long, slender.--2¢. Marin 
County. Summer. 
3. U. urnens L. Inflorescence androgynous. 
©. Cultivated lands. Spring. 
Introduced from Europe. 
2. Hesperocnide Torr. 
? perigonium gamophyllous, urceolate, com- 
pressed, minutely dentate.—© : 
12a 
