864 WEED FLORA OF IOWA 



Coma. A tuft of any sort. 



Compound. Composed of two or more similar, subordinate 

 parts united into one whole. 



Conduplicate. Folded upon itself lengthwise. 



Cordate. Heart-shaped with point upward. 



Coriaceous. Leathery. 



Corolla. Inner part of the perianth. 



Corymb. A convex, or flat-topped, indefinite inflorescence, like 

 a raceme with lower pedicels elongated. 



Cosmopolitan. Widely distributed. 



Cotyledons. The first leaves of a plant as found in the embryo. 



Creeping. Running along above ground or beneath the surface r 

 and rooting. 



Cremocarp. Fruit of Umbelliferse. 



Crenate. Dentate with rounded teeth. 



Crested. Having a ridge or terminal appendage. 



Crystalloids. Protein bodies in the form of crystals. 



Culm. The stem of grasses. 



Cuneate. "Wedge-shaped. 



Cut. Having divisions deeper than when dentate. 



Cyme. A somewhat flat-topped, determinate inflorescence, re- 

 sembling a corymb. 



Decumbent. Reclining but with end rising. 



Dehiscent. Opening in a regular manner by valves or slits to 

 discharge seeds. 



Dentate. Toothed, usually with teeth directed outward. 



Denticulate. Finely dentate. 



Determinate Inflorescence. Flowers arise from terminal bud 

 and check growth of axis. 



Diadelphous (stamens). Collected in two sets. 



Dicotyledonous. Plants producing two cotyledons. 



Diffuse. Spreading loosely and irregularly. 



Digitate. Compound with parts radiating from apex of support. 



Dioecious. Having stamens and pistils in separate flowers upon 

 different plants. 



Divided. Having incisions extending to base or midrib. 



Dorsal. Pertaining to back or outer surface of organ. 



Downy. Having a dense covering of short weak hairs. 



Elliptical. Oblong and rounded at ends. 



Emarginate. Notched at end. 



Embryo. Rudimentary plantlet within the seed. 



