444 NASTURTIUM 



Nasturtium L. Cruciferae (2). 50 cosmop. ; 4 in Brit., -including 

 N. officinale R. Br., the water-cress. In the perennial sp. buds arise 

 at the base of the year's shoot, and take root while still attached to 

 the parent. The adv. roots are said to arise exogenously. 



Nasturtium (of gardens), Tropaeolnm. 



Nastus Dioscorides ex Lunell. Gramineae (5). i N. Am. 



Nastus Juss. Gramineae (13). 3 Mascarene Is. 



Natans (Lat.), swimming (under water). 



Nathusia Ilochst. (Sclire.bcra Roxb.). Oleaceae. 4 Afr., India. 



Natsiatopsis S. Kurz. Icacinaceae. i Burma. 



Natsiatum Buch.-liam. Icacinaceae. i Himalaya. 



Natural Mstory, ecology ; - order, a group of several allied families, 

 e.g. Ranalcs, Resales ; - selection, survival of the fittest ; - system, 

 that which tries to classify plants according to their relationships. 



Naturalisation, establishment in a new country; naturalised weeds, 

 Ageratutn, Cactaceae, Cynara, Eichhornia, Elodea, Galinsoga, Lac- 

 tufa, Mimosa, Opuntia, I'ithonia, Xanthium. 



Nauclea, L. Rubiaceae (i. 6). 35 trop. As., Polynes. Fls. in spherical 

 heads. N. lanceolata Blume (N. purpurea Roxb.) has hollow swollen 

 portions of stem, below infls., inhabited by ants (cf. Acacia). 



Naudinia Planch, et Lind. Rutaceae (i). i Colombia. 



Naudiniella Krasser (Astronia p.p.). Melastom. (n). 6 Polyn. 



Naumannia Warb. (Riedelia p.p. EP.). Zingiberaceae (i). i N.G. 



Naumburgia Moench (Lysiinachia p.p. BH.}. Primul. i N. temp. 



Nautilocalyx Linden =Episcia Mart. p.p. (Gesn.). 



Nautonia Decne. Asclepiadaceae (n. i). i S. Brazil. 



Navarretia Ruiz et Pav. (Cilia p.p.). Polemoniaceae. 40 Am., esp. N. 



Navia Schult. f. (Dyckia p.p. B.H.). Bromeliaceae (2). 2 trop. S. Am. 



Navicular, boat-shaped. 



Naxiandra Krasser. Melastomaceae (in). 4 Malaya. 



Neactelis Rafin. Compositae (inc. sed.). i N. Am. 



Nealchornea Huber. Euphorbiaceae (A. n. 2). Upper Amazon. 



Nearctic, American arctic. 



Nebelia Neck. (Raspalia Brongn. EP.). Bruniaceae. 6 S. Afr. 



Necepsia Prain. Euphorbiaceae (A. 11. i). i trop. Afr. 



Neckia Korth. Ochnaceae (Violaceae BH.). 6 Indomal. 



Neck-lace tree, Onnosia; -weed (Am.), Veronica peregrina L. 



Nectandra Roland. Lauraceae (i). 70 trop. and S. subtrop. Am. N. 

 Rodiaci Hook, (greenheart) and others good timber. 



Nectarine, Prunus persica Stokes, var. 



Nectaripetalum Pohl. Inc. sed. Nomen. 



Nectaropetalum Engl. Linaceae. 2 trop. Afr. 



Nectary, a honey-secreting gland, usu. floral, Aionitnm, Alisma, Allinn/, 

 Aquileg'ia, Berberidaceae, Borago, Campanulafeae, Compositae, Del- 

 phinium, Eranthis, Lab/atae, Leguminosae, Martgravia, Nigel la, 

 Norantea, Ramtnculaceae, Tilia, sometimes extra-floral, Alcitrites, 

 Convolvulaceae, Primus, Triumfetta, 7^irneraceae, Viola; sham-, 

 Lopezia, Parnassia. 



Nectouxia H. B. et K. Solanaceae (2). i Mexico. 



Neea Ruiz et Pav. Nyctaginaceae. 30 trop. S. Am., W.I. The 1. of 

 N. theifera Oerst. (caparrosa) are used as tea, and yield a black dye. 



