FLORA OF THE DISTRICT OF COLUMBIA. 299 



Gland. A secreting cell or cellular structure. 



Glandular. Glandlike, or bearing glands. 



Glaucous. Covered with "white or bluish bloom. 



Globose. Spheric or essentially so. 



Glomerate. Compactly clustered. 



Glomerule. A small dense eyme. 



Glume. One of the lowest pair of bracts in the spikelet of grasses. 



Gregarious. Growing in groups of several to many individuals. 



Habit. The general appearance of a plant. 



Habitat. The characteristic environment of a species. 



Halberd-shaped. Same as hastate. 



Hastate. Shaped like an arrowhead, but with the basal lobes pointing outward. 



Head. A dense cluster of sessile or nearly sessile flowers. 



Herb. A plant with no persistent woody stem above ground. 



Herbaceous. (1) Having the characters of an herb, as opposed to a woody or partly 

 woody plant; (2) leaflike in texture and color; (3) of a firm, rather brittle consist- 

 ency, breaking readily. 



Hilum . The scar or email area of attachment of a seed . 



Hirsute. With rather coarse or stiff straight hairs. 



Hirtellous. Minutely hirsute. 



Hispid. With stiff or bristle-like hairs. 



Hispidulous. Minutely hispid . 



Hood. A concave form of petal or sepal resembling a monk's hood . 



Hyaline. Translucent. 



Hybrid. The offspring from crossing two species. 



Imbricate. Partially overlapping or, in a flower bud, at least one segment wholly ex- 

 ternal and one internal. 



Imperfect. Pertaining to flowers which lack either stamens or pistils; unisexual. 



Incised. Cut sharply and rather deeply, often irregularly. 



Included. Not protruding from the surrounding organs. 



Indefinite. Of uncertain number or very numerous. 



Indehiscent. Not opening spontaneously. 



Indigenous. Native to the region. 



Indurate. Hardened. 



Indusium. The small, often membranous, special structure covering the sorus in 

 ferns. 



Inequilateral. Unequal-sided. 



Inferior. Situated below another organ; more particularly referring to an ovary adher- 

 ent to the calyx. 



Inflated. Bladder-like. 



Inflorescence. The flowering portion of a plant; the mode of arrangement of the flowers . 



Infra- . A latin prefix signifying below ; as infra-stipular, below the stipules. 



Insertion. The mode of attachment of one organ to another; the position of an organ 

 relative to another. 



Internode. The portion of a stem or branch between two nodes. 



Involucel. A secondary involucre, as in the Apiaceae . 



Involucrate. Having an involucre. 



Involucre. A whorl of distinct or united bracts or leaves subtending a flower or flower 

 cluster. 



Involute. Rolled inward from the margins upon the upper surface. 



Irregular. Referring to flowers whose corresponding parts are unequal in size, form, 

 or structure. 



Keel. The two lower united petals of a papilionaceous flower; the midnerve of a 

 compressed floral bract in grasses and sedges. 



