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Glossary 



Hauslbria. The specialized roots of para- 

 sites. 

 Head. A dense cluster of sessile or nearly 



sessile flowers. 

 Herb. A plant with no persistent woody 



stem above the ground. 

 Hirsute. Pubescent with rather coarse or 



stiff hairs. 

 Hispid. Beset with rigid or bristly hairs. 

 Hyaline. Thin and translucent, rarely 



transparent. 

 Hypanthium. An enlargement of the torus 



under the calyx. 

 Hypogynous. Borne at the base of the 



ovary. 

 Imbricate. Overlapping. 

 Imperfect. Flowers with either stamens or 



pistils, but not with both. 

 Incised. Cut sharply and irregularly, more 



or less deeply. 

 Included. Not projecting beyond the sur- 

 rounding parts. 

 Incumbent (cotyledon). Lying with the back 



of one against the radicle. 

 Indehiscent. Not opening. 

 Indurated. Hardened. 

 Indiisium. The membrane covering a sorus 



in ferns. 

 Inflorescence. The flowering part of a plant. 

 Innovation. An offshoot from a stem 



(grasses). 

 Internodc. The portion of a plant between 



two nodes. 

 Introrse. Facing inward. 

 Introduced. Brought intentionally from an- 

 other region, as for cultivation. 

 Involucre. A circle or collection of bracts 



surrounding a flower cluster or head, or a 



single flower. 

 Involute. Rolled inward. 

 Irregular (flower). Having one or more of 



the organs of the same series unlike or 



unequal. 

 Krcl. A central dorsal ridge; the two 



anterior united petals of a papilionaceous 



flower. 

 Labiate. Provided with a liplike organ. 

 Laciniate. Cut into narrow lobes or seg- 

 ments. 

 Lacuna. Small depression or pit on a 



surface. 

 Lanceolate. Several times longer than wide, 



tapering at both ends, widest about a 



third above the base. 

 Latex. The milky sap of certain plants. 

 Leaflet. One of the divisions of a compound 



leaf. 



Legume. The fruit of the Leguminosae, 



formed of a simple pistil. 

 Lemma. The lower of the two bracts 



inclosing the flower in grasses. 

 Ligule. A thin appendage between the base 



of a leaf blade and its sheath (grasses); 



the oblong appendage of the ray flowers 



in Compositae. 

 Linear. Elongated like a blade of grass, 



with nearly parallel sides and at least six 



times as long as wide. 

 Lbbed. Divided to about the middle. 

 Lbment. A jointed legume, the constric- 

 tions usually between the seed. 

 Membranaceous. Thin and semi-transparent. 

 Midrib (midvein). The central rib or vein 



of a leaf or other organ. 

 Moniliform. Like a string of beads. 

 Monoecious. With stamens and pistils in 



separate flowers on the same plant. 

 Mucronate. With a short, sharp, abrupt tip. 

 Native. Indigenous to the area where it is 



found. 

 Naturalized. Not indigenous to the region 



where found, but so well established as to 



have become a part of the flora. 

 Node. The juncture of two internodes. 

 Nodulose. Knotty. 

 Nut. An indehiscent 1-seeded fruit with a 



hard or bony pericarp. 

 Nutlet. A diminutive nut. 

 Obcordale. Inversely heart-shaped. 

 Oblanceolate. Inverse of lanceolate. 

 Oblong. Longer than broad and with 



nearly parallel sides. 

 Obbvoid. Inversely ovoid. 

 Obtuse. Blunt or rounded at the end. 

 Ocrea (Polygonum) . The sheathing, united 



stipules. 

 Ochreola (Polygonum). The ocrcae sub- 

 tending flowers. 

 Ovary. The part of a pistil containing the 



ovules . 

 Ovoid. Shaped like a hen's egg. 

 Ovule. The body which after fertilization 



becomes the seed. 

 Palea. The upper bract which, with the 



lemma, incloses the flower in grasses. 

 Palmate. Diverging radiately like the 



fingers. 

 Paniculate. A loose, irregular, compound 



inflorescence with pedicellate flowers. 

 Papilionaceous (corolla). Having a stand- 

 ard, wings, and keel, as in the peculiar 



corolla of many Leguminosae. 

 Papillose. With minute, blunt projections. 

 Piippus. The bristles, awns, teeth, etc. 



surmounting the achene in Compositae. 



