GLOSSARY. 787 



Micropyle. The small opening of the seed coat, through which the radicle 



of the embryo protrudes on the germination of the seed (p. 425). 

 Microsporangium. The sporangium, in the higher heterosporous plants, 



which produces only microspores (pp. 120 and 298). 

 Microspore. The spore which produces the male gametophyte (p. 298). 

 Microsporophyll. The sporophyll which produces only microsporangia (pp. 



105 and 375). 

 Monadelphous. Stamens united into a hollow tube by their filaments, as 



in the Mallow Family (p. 382). 

 Monoecious. A plant having both staminate and pistillate flowers on the 



same individual, as in the chestnut (p. 392). 

 Mucronate. Applied to a leaf in which the midrib is continued above 



the summit in the form of.a short narrow tip, as in Senna (p. 356). 

 Mycelium. The interwoven hyphae of the fungi (p. 41). 

 Naked Flower. One in which the floral envelope is wanting, as in the 



Willow. 



Nectar. A peculiar sugar secreted by special glands in the flower. 

 Nerve. A vein in the leaf. 



Node. That portion of the stem from which the leaves arise (p. 320). 

 Nucellus. The portion of the ovule surrounding the embryo-sac (p. 124). 

 Nut. An achene-like fruit, the pericarp of which is more or less hard, as 



the chestnut (p. 420). 



Nutlet. The small achene-like fruit characteristic of the Labiatae (p. 420). 

 Ocreate. Applied to the fringed and clasping stipules of the Polygonums 



(p. 357). 



Orthotropous (Atropous). Applied to a straight ovule, having the fora- 

 men at the summit and the stalk at the base (p. 379). 

 Pale ( Palea or Palet). The bract or fore leaf, which encloses the lodi- 



cules and the individual flowers of the grasses (p. 466). 

 Palmate. Resembling an open hand with the fingers extended, as the 



leaves of the Castor oil plant (p. 355). 

 Panicle. A branched or compound raceme (p. 3%). 

 Papillose (Papillate). Covered with papillae, or short, conical hairs 



having rounded summits, as the petals of Primula (p. 407). 

 Pappus. The modified calyx in the Compositae, consisting of either bristles, 



awns or teeth at the summit of the achene. 

 Parasitic. A plant which depends upon another plant or an animal for 



its sustenance (p. 40). 

 Parietal. Applied to the placentae, when they extend from the central 



axis to the walls of the carpel, carrying the ovules or seeds with 



them, as in the watermelon. 

 Parted. Deeply cleft, the divisions extending near to the midrib or base 



of the leaf. 



Pectinate. Having teeth like a comb. 



Pedicel. The stalk or support of a single flower (p. 393). 

 Peduncle. A stalk supporting a cluster of flowers ; also applied to the 



stalk of a single flower. 

 Peltate. Having the petiole inserted at or near the centre of the dorsal 



surface of an orbicular lamina, as in the leaves of the nasturtium. 

 Perennial. Applied to plants that persist for more than two years. 

 Perfect. Applied to flowers having stamens and pistils that are capable 



of fecundation. 

 Perianth (Perigone). Applied to the floral envelopes, when the two 



circles, are alike in color and form, as in the Easter Lily. 

 Pericarp. The ripened ovarv or fruit wall (p. 410). 

 Pericycle ( Pericambium). The stratum of cells beneath the endodermis 



(p. 312). 



