CLASS I. 
INDIVIDUAL ABSOLUTE TERMS. 
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17. lihomhoidi (rhombeus, rhomhoideus) \ oval, a little angular in 
the middle ; as the leaf of Hibiscus rhombifolius. 
18. Deltoid (deltoides^ ; a solid, the transverse section of which 
has a triangular outline, like the Greek A : as the leaf of 
Mesembryanthemum deltoideum. 
19. Triangular (triangularis) \ having the figure of a triangle of 
any kind ; as the leaf of Betula alba. 
20. Trapeziform (trapeziformis, trapezoideus) ; having four edges, 
those which are opposite not being parallel ; as the leaf of 
Adiantum trapeziforme, Populus nigra. 
21. Heart-shaped ; having two round lobes 
at the base, the whole resembling the heart in a pack of 
cards ; as the leaf of Alnus cordifolia. 
22. Eared (auriculatus) ; having two small rounded lobes at the 
base ; as the leaf of Salvia officinalis. 
23. Crescent-shaped (lunatus, lunulatus, f semilunatus) ; resem- 
bling the figure of the crescent ; as the glandular apex of the 
involucral leaves of many Euphorbias. 
24. Kidney-shaped (reniformis^ -j- renarius) ; resembling the figure 
of a kidney ; that is to say, crescent-shaped, with the ends 
rounded ; as the leaf of Asarum europaeum. 
25. Arrow-headed (sagittatus) ; gradually enlarged at the base 
into two acute straight lobes, like the head of an arrow ; as 
the leaf of Rumex Acetosella. 
26 27 28 
26. Halbert-headed (hastatus) ; abruptly enlarged at the base 
into two acute diverging lobes, like the head of a halbert ; as 
the leaf of Arum maculatum. 
27. Fiddle-shaped (panduratus^ panduriformis ) ; obovate, with a 
