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74* INTRODUCTION TO BOTANY.
of composition : the primaiy footstalk divided into secondary
footstalks, and those into third-rank footstalks.
Triternate, trUernata. The primary footstalk divided!
into three, and each of these into three others; all the nine?
bearing three leaflets each. Epimedium ^Ipinum, Crithmum
maritimum,. Smyrnium vulgare, Acteea spicata. PI. 6,
Tripinnate, tripinnata. The common footstalk has on
its sides secondary footstalks, and these have also on their
sides third-rank footstalks, to the sides of which leaflets are
attached. Daucus vulgaris, Phellandrium aquaticum, Thalictrum
minus.
The leaflets of compound leaves admit most of the
characters of simple leaves.
16. Expansion.
Flat, Folia plana. Most plants.
Convex, convexa. The upper face convex, the lower'
concave. Ocymum Basilicum raajus.
Concave, concava. The upper face concave, the lower
convex, Drosera rotundifolia, tjmbilicus pendulinus, Saxifraga
oppositifolia.
Grooved, channelled, canaliculata. Long, with a hollow
channel throughout their whole length. Lygeum Spartum,
Salsola decumbens, Pinus sylvestris.
Keeled, caritiata^ Grooved, with a projection on the
under surface the whole length, like the keel of a vessel.
Sparganium erectum, Tragopogon pratense, Stellaria ho-
lostea. Narcissus biflorus, Ajax fenestralis.
Folded, plicata. Having sevei'al folds lengthways. Veratrum
album, Altheea officinalis, Malva sylvestris.
Puckered, crispa. Wrinkled irregularly over the whole
surface. Rumex crispus, Mentha crispa, Malva crispa,
Hypericum crispum.
BuUate, hullata. With the upper surface raised up in
bubblelike or conical tubercles, which are hollowed on the
under side. Lamium Orvalla, Ocymum Basilicum majus.
PI. 6, fig. 2.
Wrinkled, riigosa. With the veins sunk in a little, so
as to form a number of wrinkles. Salvia officinalis, Scorodonia
solitaria, Marrubium vulgare.
Waved, undulala. The edge rising and falling alternately
in roundish folds like waves. Persicaria acris, Bis-
torta major, Jasione montana, Inula pulicaria.