52 
Colorado Agricultural College 
Fig-. 87. Large- 
leaved Avens (Geum 
macrophyllum). A. & 
B. Top views. C. Edge 
view. X 6. 
2. Avens 
{Geum L.) 
Achenes numerous, small, dry, usually 
hairy, with a characteristic tail or hooked 
l)eak. 
Large-leaved Avens {Geum macrophyllum 
Willd.) (Fig. 87). — Seeds Hay’s russet to 
hazel in color, flattened, hairy, tipped with 
a long, slender, hooked beak (persistent 
style), usually as long as the achene; seeds 
3-4 mm. long, .7-1 mm. wide. 
3. Cinquefoil, Five-Bnger 
{Potentilla L.) 
The fruits are dry achenes ; achenes 
usually swollen or inflated, kidney to oval- 
shaped, smooth or ridged. 
Rough Cinquefoel {Potentilla mon- 
spelicfisis L.) (Fig. 88). — Seeds buck- 
thorn-brown in color, flat-oval in cross- 
section, kidney-shaped, marked with 
forked, rounded ridges, the longest ridge 
usually parallel to the rounded edge oppo- 
site the hilum, or point of attachment ; 
seeds ,5-.7 min. long, .3-. 5 mm. wide. 
16. PEA FAMILY OR 
(Fabaceae Rcichenb., Papihonaceac L. or Legiiminosae Jiiss.) 
Fruit a more or less elongated pod splitting along its length 
by 2 valves or retaining its seeds at maturity; seeds usually with- 
out endosperm; the cotyledons (leaves of the embrvo) are mostly 
thick and fleshy; seeds oval, spherical, cordate, cvlindrical, reni- 
form, and irregular; scar (hilum) and notch at the toj), or side of 
the seed ; hilum a line or point. 
Fig 88. Rough Cin 
quefoil (P o te n t i 1 1 a 
monspeliensis). A. Top 
view. B. Edge viev . 
X 35 
PULSE FAMILY 
Key to Genera 
Seeds spherical, or nearly so 1 Vida 
Seeds not spherical 
Seeds enclosed in a prickly, often persistent pod 2 . .Crlycyvrhiza 
Seeds not enclosed in a prickly pod 
Seeds with the hilum near the middle of one side 
Seeds regular in shape 
i..Psoralea 
Seeds 1.5-2.5 mm. long i . .TritoUum 
„ - . (not T. procumbcns) 
Seeds usually irregular in shape, 1.5-3 mm. long, somewhat 
flattened S . .Uclicago 
Seeds with the hilum near one end 
Seeds .7-1 mm. long, shiny d . .Trifolium 
Seeds 1.5-2.5 mm. long, dull ll TeltiSliT* 
