NAEGELIA 
478 
Naegelia Regel ( Smithiantka O. Ktze.). Gesneriaceae (11). 6 sp. 
Mexico ; several are favourite stove plants. They form subterranean 
runners, covered with scaly leaves. 
Nageia Gaertn. = Podocarpus L/Herit. 
Naiadaceae. Monocotyledons (Helobieae). Only genus Xaias (q.v.). 
As defined by Benth.- Hooker the order includes a number of plants 
here placed in different orders, viz. Potamogetonaceae, Naiadaceae, 
Aponogetonaceae, and Juncaginaceae. 
Najas Linn. Naiadaceae. 15 sp. cosmop.; 2 in Brit. Freshwater 
annual plants, submerged, with slender stems and opp. usually toothed 
linear leaves. Firs, diclinous; the g consists of a single anther, 
which is terminal on the axis (see Goebel's Entwicklungsgeschichte der 
Planzenorgane p. 278) and 1- or 4-loc., enclosed in two sheathing 
perianths ; the ? fir. consists of an ovary of one cpl., naked or sur- 
rounded by a perianth-like organ. Pollination occurs under water as 
in Zostera, but the pollen is spherical. Ovule 1, anatropous, terminal 
on the axis. Embryo straight ; no endosperm. [See Nat. PJi. and 
Eichler’s Bliithendiag. ] 
Nama Linn. Hydrophyllaceae. 27 sp. Am., Sandwich Is. 
Nandina Thunb. Berberidaceae. 1 sp., N. domestica Thunb., China, 
Japan. The perianth (including 2 whorls of honey leaves) is in 9 
whorls, showing a more petaloid structure as they near the centre. 
Napaea Linn. Malvaceae (11). 1 sp. N. Am. Dioecious. 
Napoleona Beauv. Lecythidaceae. 7 sp. W. trop. Afr. The fir. has a 
certain resemblance to that of Passiflora, owing to the corona of 
staminodes. Ovary 5 — 20- loc. Berry. 
Narcissus (Toum.) Linn. Amaryllidaceae (1). 40 sp., Eur., Medit., 
As. Several are favourites in horticulture, eg. N. Pseudo-narcissus 
L., the daffodil, N. poeticus L. the poet's Narcissus, N. Jonquilla L., 
the jonquil, N. Tazetta L., and others. The corona is well de- 
veloped, and free from the stamens (see order). 
Nardcfstachys DC. Valerianaceae. 2 sp. Himal. • N. Jatamansi DC., 
the spikenard, has very fragrant rhizomes. 
Nardus Linn. Gramineae (xn). 1 sp. Eur., W. As., N. strida L., 
the nard or mat-grass, common on moors in Brit. The infl. is 
markedly unilateral (an unusual feature in § xn). The grass is of no 
feeding value. 
Narthecium Moehr. Liliaceae (1). 4 sp. N. temp.; N. ossifragum 
Huds. (bog-asphodel), abundant on wet moors in Brit. It has a 
sympodial rhizome and isobilateral leaves (the xerophytic structure is 
rendered necessary by the coldness of the soil, which checks absorp- 
tion). The fir. is conspicuous, but contains no honey (p. 88). 
Narthex Falc. = Ferula Toum. N. Asafoetida Falc. = /\ Narthex. 
Nassauvia Comm. ex. Juss. Compositae (xii). 40 sp. Andes. 
Nasturtium Linn. Cruciferae (11. 11). 50 sp. cosmop.; 4 in Brit., 
including N. officinale R.Br., the water-cress. In the perennial sp. 
