U\ 
Coi,ORADo Agricultural College 
6 
A B 
Fig. 97. Geranium 
(Geranium sp.) A. 
Top view. B. Bottom 
view. X 14. 
Geranium 
(Fig. 97). 
18. WOOD SORREL FAMILY 
( Oxalidaceae) 
{Geranium sp.) 
Fruit a capsule, nearly spherical or oblong, seldom berry-likc; 
endosperm fleshy ; embryo flat, straight. 
Wood Sorrel Yellow Wood Sorrel 
(Oxalis L., Xanthoxalis, Small 
Capsule oblong or angular with flat sides, or cylindrical ; seeds with the 
hdum and micropyle nearly together; seeds usually rough, ridged or grooved: 
endosperm abundant; embryo large and straight. 
Yellow Wood Sorrel {Oxalis stricta L., 
Xanthoxalis stricta L.) (Fig. 98).— Seeds bay 
to almost black in color, flat, egg-shaped to ovate 
in outline, rounded at one extremity, pointed at 
the other, roughened by 7-10 broken, white- 
tipped, transverse ridges and occasionally a 
groove running the length of the seed ; the edges 
are usually marked by one white-tipped ridge 
extending almost entirely around the seed ; 
seeds 1-1.2 mm. long, .0-.8 mm. wide. 
Fig. 98. Yellow Wood j 
Sorrel (Oxalis stricta). 
A. Top view. B. Edge 
viev . X 25. 
19. SPURGE FAMILY 
(Buphorbiaccae) i 
Fruit mostly a 3-lobed capsule, splitting into three parts | 
(carpels) at maturity; seeds with the micropyle next the hilum, | 
usually roughened by ridges or projections; endosperm oily and ^ 
fleshy; embryo straight or slightly curved; cotyledons large. 
Spurge, Carpet Weed 
{Euphorbia L., Lepadcuia Raf.) | 
Capsule smooth, three-lobed, with rounded or sharp angles; seeds occa- t 
sionally with an appendage near the hilum; seeds angled, pitted, ridged of | 
transversely wrinkled. j 
