Jones: Flora of Illinois 361 



Hispid. Beset with risid hairs or bristles. 



HispiDULOUS. Minutely hispid. 



Hyaline. Thin and translucent. 



Hybrid. A plant (or animal) derived from the erossing of two distiiut varieties 



or species; plants that appear to be intermediate between given or 



assumed parents. 

 Hyp.'Xnthium. The cup-shaped or tubular receptacle on which the perianth 



and the stamens are inserted. 

 Hypogynium. a structure supporting the ovary in some sedges. 

 Hypogynous. Borne on the receptacle beneath the ovary; said of stamens 



and petals. 



Imbricate. Overlapping, as shingles on a roof. 



Incised. Sharply and more or less deeply and irregularly cut. 



Included. Not at all exserted or protruded, as stamens not projecting from 

 the corolla. 



Indehiscent. Not opening regularly. 



Indurate. Hardened. 



Indusium. The covering of the sori of some ferns. 



Inferior. Said of an ovary when the other floral parts appear to be inserted 

 upon it. 



Inflorescence. The arrangement of the flowers on the stem. 



Internode. The portion of the stem between the nodes. 



Lntroduced. Brought intentionally from another country or region. 



Involucel. a secondary involucre; that subtending the umbellets in the 

 Umbelliferae. 



Involucre. A whorl or group of bracts surrounding or subtending a single 

 flower, or the collection of bracts aggregated at the base of an in- 

 florescence, as the heads of Compositae, or in the umbels of Um- 

 belliferae. 



Involute. A type of vernation, in which the margins are rolled inward or 

 toward the upper side. 



Irregul.\r (flower). See Zygomorphic. 



Keel. A central dorsal ridge like the keel of a boat; the structure formed 

 by the two lower united petals of a papilionaceous flower; the midvein 

 of a compressed floral bract in grasses and sedges. 



Laciniate. Cut into narrow pointed lobes. 



Lanceolate. Lance-shaped; much longer than broad, widening above the 

 base, and tapering to the apex. 



Lanceoloid. a solid body lanceolate in longitudinal section. 



Leaflet. One of the blades of a compound leaf. 



Legume. The fruit of certain Leguminosae. a pod formed from a simple pistil, 

 and dehiscent along both sutures. 



Lemma. The lower of two bracts enclosing the flower in grasses. 



Lenticul.\r. Lentil-shaped, that is, with the shape di a biconvex lens. 



LiGULATE. Provided with or resembling a ligulc. 



LiGULE. A thin, often scarious projection from the top of the leaf-sheath in 

 grasses and similar plants; the principal part of the corolla of ray- 

 florets in numerous Compositae; the membranous structure on the adaxial 

 surface of the leaf of Isoetes and Selaginella. 



