HYDNOPHYTUM 



443 



HYDROCHARIS 



downy pile when mature ; other stigmas, when full 

 grown, become moist or clammy, and when these states 

 are reached the pollen may be applied with a camel's- 

 hair brush or pencil. The forenoon or middle of the 

 day is the best time to conduct the operation, because 

 the atmosphere is usually dry and the pollen in the most 

 powdery and workable condition, though it may be done 

 at any other tune while similar conditions prevail. 



HYDNOPHY'TUM. (From hudneo, to nourish, to 

 nurse, and phuton, a plant ; in allusion to the habit the 

 plants have of giving shelter to ants. Nat. ord. 

 Rubiacea.) 



Remarkable stove plants that harbour ants in the 



swollen, galleried base of their stems. Cuttings in sand 



in a close case, with bottom-heat. Loam, peat, and sand. 



H. andamane' nsc (Andaman). Andaman Islands. 



Forbe'sii (Forbes's). White. Fruit red. New 



Guinea. (B. M., t. 7218.) 

 ,, formica'rum (ants'). Malaya. 



longiflo'rum (long-flowered). White. Fiji. (B. M., 

 t. 7343-) 



HYDRA NGEA. (From hudor, water, and aggeion, a 

 vessel ; referring to the cup-form of the capsule, or seed- 

 vessel. Nat. ord. Hydrangeads [Saxifragaceae]. Linn. 

 io-Decandria, z-Digynia.) 



Deciduous shrubs. Propagated by division of the 

 roots, cuttings of the ripened shoots, and nourishing 

 best in moist, sheltered places. Horte'nsis, the common 

 garden Hydrangea, though a little more tender, stands 

 the winter well in the southern parts of the island ; and 

 though cut down in most winters in the neighbourhood 

 of London, yet, if a slight protection of mulching is 

 thrown over the roots, the stems will rise strongly, 

 and bloom well after Midsummer, if care be taken to 

 remove all the weaker ones, just as is done with a Fuchsia 

 stool. This species makes also fine ornaments in pots, 

 and may be propagated at almost any time ; the young 

 side-shoots, when two or three inches in length, inserted 

 in sandy soil and in heat, striking in a few days, while 

 the old stems will strike anywhere, but require their 

 time. To grow it well requires light, rich compost, well 

 drained, and abundance of water. The flower generally 

 appears first of a greenish colour, becoming of a pale 

 rose ; but in some districts the colour becomes a beautiful 

 blue. Notwithstanding all the experiments that have 

 been made, there is still a little doubt as to the cause 

 that produces the change. When iron filings and a 

 solution of alum are used, in some soils the blue colour 

 is produced, while the same means will not produce it in 

 others ; and other soils will almost invariably produce 

 this blue colour without any peculiar matter whatever 

 being added. The loams at Kenwood, at Hampstead 

 Heath, and Stanmore Heath, and the peats at Wimble- 

 don, as well as some bogs near Edinburgh, are famous 

 for producing this blue in the Hydrangea. When trying 

 artificially with iron filings and alum-water, we have had 

 different colours on the same plant. This variation is 

 merely temporary it cannot be propagated like a 

 variety : a cutting from a blue plant will produce a rose 

 one, unless the peculiar treatment be continued. 



GREENHOUSE. 

 H. acumina'ta (long-pointed). See H. HORTENSIS 



ACUMINATA. 



Belzo'nii (Belzoni's). See H. HORTENSIS. 



cyane'ma (dark-coloured or dark-blue). See H. 



ROBUSTA. 

 horte'nsis (garden). 2-6. Changing from green to 



pink, or sometimes blue. Summer. China and 



Japan. 174- 



acumina'ta (long-pointed).. Rose. Japan. 1874. 

 ,, a'lba (white). Pure white. 1909. 

 cyano'clada (blue-branched). See H. HORTENSIS 



NIGRA. 



Li'ndleyi (Lindley's). Rosy-white. 

 macrose'pala (large-sepalled). White. 

 Marie'sii (Maries's). Outer flowers large, pink 



or mauve. 



ni'gra (black-stemmed). Stems dark blue. 

 niva'lis (snowy). Leaves white along the middle ; 



stems white. 1904. 

 Ota'ksa (Otaksa). Flesh. Japan. 1868. 



H. horte'nsis ra'nitdo-cocci'nea (scarlet-branched). Large 



pale rose. Young shoots plum-red. 1890. 

 stella' to. (starry). Pink, starry. Japan. 1868. 

 stella'ta fimbria'ta (fringed-s tarry). Flowers 



fringed. 



stdla'ta ro'sea (rosy-starry). Bright rose. 

 stdla'ta ru'bra ple'na (double red). 

 tricolor (three-coloured). Leaves white and pale 



green, edged yellow. 1882. 

 variega'ta (variegated). Leaves variegated. 

 Vei'tchii (Veitch's). Pure white. 1903. 

 japo'nica (Japan). See H. HORTENSIS. 

 robu'sta (robust). Pink, white. Himalaya. (B. M.. 



t. 5038.) 

 stella' ta (starry- flowered). See H. HORTENSIS STELLATA. 



HARDY. 



H. alti'ssima (tallest). Himalaya. 

 arbore'scens (tree-like). 6. White. July. Eastern 



United States. 1736. 

 di'scolor (two-colowed-leaved). 6. White, green. 



August. N. Amer. 

 grandiflo'ra (large-flowered). Large, pure white, 



sterile. 1907. 



a'spera (rough). Large, numerous; white. Hima- 

 laya and China. 1889. 

 ,, ,, macrophy'tta (large-leaved). China. 

 ,, Bretschnei deri (Bretschneider's). White. China. 



1884. 

 cine'rea ste'rilis (barren). Flowers nearly all enlarged, 



sterile, white. Ohio, U.S.A. (?) 1908. 

 corda'ta (heart-leaved). See H. ARBORESCENS. 

 ,, heteroma'lla(vaxious-haiTed-leavcd). See H. VESTITA. 

 ,, involucra'ta (involucrated). 2. White and pale blue. 



Japan. 1875. 



,, lo'ngipes (long-stalked). China. 

 ni'vea (snow-white-leaved). See H. RADIATA. 

 ,, panicula'ta (panicled). 2-4. Barren flowers few, 



white. 

 , floribu'nda (free-flowering). See H. PANICULATA 



GRANDIFLORA. 



,, grandiflo'ra (large-flowered). Flowers all sterile, 



large, white. Japan. 1867. 

 petiola'ris (long-petioled). 6-15. White. May. 



Japan. 1878. 



,, pube'scens (downy). See H. BRETSCHNEIDERI. 

 quercifo'lia (oak-leaved). 4. White. July. S.E. 



United States. 1803. 

 radio.' ta (rayed). 4-6. White. August. S.E. United 



States. 1786. 



cane'scens (hoary). Leaves felted, whiter. 

 ,, ,, glabe'lla (smooth). 5. White, green. July. 

 ,, sca'ndens (climbing). See H. PETIOLARIS. 

 zerra'ta (saw-edged). Japan. 

 Thunbe'rgii (Thunberg's). Rose to blue. Japan. 



1870. 

 vesti'ta (clothed). 4. White. Himalaya. 1821. 



HYDRA STIS. Yellow Root. (From hudor, water; 

 referring to the marshy places where it grows. Nat. 

 ord. Crowfoots ( Ranunculaceae]. Linn. i^-Polyandria, i- 

 Monogynia. Allied to Caltha.) 



Hardy herbaceous perennial. Division of the root; 

 loam and peat ; moist situation. 



H. canade'nsis (Canadian). . Green. May. N. Amer. 

 1759- 



HYDRIA STELE. (From hudria, a water-bucket, and 

 stelee, a stem ; in allusion to the cupped bracts and 

 bracteoles. Nat. ord. Palmaceae.) 



Stove Palm. Seeds. Fibrous loam, peat, and sand. 

 H. ivendlandia'na(\\'eudla.ndia.n). Trop. Australia. 1878. 



HYDRO" CERA. (From hudor, water, and keros, a 

 horn ; in allusion to the horn-like leaves. Nat. ord. 

 Geraniaceae. Allied to Impatiens.) 



Aquatic or marsh stove herb. Seeds and divisions. 

 Loam and leaf-mould in a warm tank. 

 H. angustifo'lia (narrow- leaved). 2. Red. July. E. 



Ind. ; Malaya. 1810. 

 triflo'ra (three-flowered). See H. ANGUSTIFOLIA. 



HYDRO'CHARIS. (From hudor, water, and charis, 

 delight ; in allusion to the beauty of the flowers of the 

 plant floating on water. Nat. ord. Hydrocharidaceae.) 



An aquatic, with rosettes or tufts of small round 



