MARGIN OP LEAF 33 



AcEROSE or ACICULAE, tipped with a needle-like point, as Juniper. 



Deltoid, when the shape of the Greek letter A, as Chenopodium. 



{h) Apex of Leaf. — Acute, when the margins form an acute angle 

 at the tip of the leaf. Ex. : Eriodictyon. 



Acuminate, when the point is longer and more tapering than the 

 acute. Ex. : PelHtory. 



Obtuse, blunt or round. Ex. : Buchu. 



Truncate, abruptly obtuse, as if cut square off. 



MucRONATE, terminating in a short, soft point. 



Cuspidate, like the last, except that the point is long and rigid. 



Aristate, with the apex terminating in a bristle. 



Emarginate, notched. Ex. : Pilocarpus. 



Retuse, with a broad, shallow sinus at the apex. 



Obcoedate, inversely heart-shaped. 



(c) Base of Leaf. — Cordate, heart-shaped. Ex. : Lime. 



Reniform, kidney-shaped. Ex. : Ground Ivy. 



Hastate, or halbert-shaped, when the lobes point outward from 

 the petiole. Ex. : Aristolochia Serpentaria. 



AuRicuLATE, having ear-like appendage at the base. 



Sagittate, arrow-shaped. Ex. : Bindweed. 



{d) Margin of Leaf. — Entire, when the margin is an even line. 



Serrate, with sharp teeth which incline forward like the teeth 

 of a hand-saw. Ex. : Peppermint. 



Dentate, or toothed, with outwardly projecting teeth. Chestnut. 



Crenate, or Scalloped, similar to the preceding forms, but with 

 the teeth much rounded. Ex. : Digitalis, Salvia. 



Repand, or Undulate, margin — a wavy line. 



Sinuate, when the margin is more distinctly sinuous than the last. 



Incised, cut by sharp, irregular incisions. Ex. : Hawthorn. 



Runcinate, the peculiar form of pinnately incised leaf observed 

 in the Dandelion and some other Compositae in which the teeth are 

 recurved. 



A LoBED leaf is one in which the indentations extend nearly to the 

 mid-vein, or mid-rib, as it is usually called, the segments or sinuses, 

 or both, being rounded. Ex. : Sassafras. 



Cleft is the same as lobed, except that the sinuses are deeper, and 

 commonly acute. Ex. : Dandelion. 



A Parted leaf is one in which the incisions extend nearly to the 

 mid-rib. Ex.: Geranium maculatum. 



