YELLOW CENTAURY 



916 



YUCCA 



YELLOW CENTAURY. Chlo'ra perfolia'ta. 

 YELLOW CRESS. Barbare'a prafcox. 

 YELLOW ELDER. Teco'ma ste's. 

 YELLOW EVERLASTING. Helichry'sum arena! num. 

 YELLOW-EYED GRASS. Xy'ris. 

 YELLOW GARDEN HAWK WEED. To'lpis barba'ta. 

 YELLOW IRIS. 1'risPseuda'corus. 

 YELLOW LARKSPUR. Tropce'olum. 

 YELLOW PUCCOON. Hydra'stis canade'nsis. 

 YELLOW RATTLE. Rhina'ntiius Cri' sta-ga'lli. 

 YELLOW ROCKET. Barbare'a vulga'ris. 

 YELLOW ROOT. Hydra'stis canade'nsis. 

 YELLOW STAR FLOWER. Sternbe'rgia lu'tea. 

 YELLOW STAR OF BETHLEHEM. Ga'gea lu'tea. 

 YELLOW SULTAN. Centau'rea moscha'ia f.a'va. 

 YELLOW WATER LILY. Nu'phar lu'teum. 

 YELLOW WEED, DYER'S. Rese'da Lu'leola. 



YELLOW WOOD. Cladra'stis tincio'ria, Ochro'sia bor- 

 bo'nica, and Podoca'rpus. 



YELLOWWORT. Chlo'ra perfolia'ta. 

 YEVERING BELLS. Py'rola secu'nda. 

 YEW. Ta'xus. 



YEW-BUD GALLS. Small, green, cone-like bodies, 

 made up of small leaves, may often be found on the Yew 

 at the ends of the branches and twigs. Their origin is 

 due to the irritation set up by the larva of Cecidomyia 

 taxi, a small, two-winged fly. An egg is laid at the tip 

 of the shoot, and the action of the larva is to prevent the 

 young shoot from elongating, so that all the leaves for 

 that year merely enlarge to form the cone. The larva 

 lives in this gall all the year, emerging in June. By 

 gathering the galls during summer, and burning them, 

 the fly will be destroyed. 



The Yew-bud Mite (Eriophyes psilaspis) settles in buds 

 on any part of a stem or branch, just as they commence 

 to open, and retards the growth of the buds, which form 

 scaly galls, similar in size and shape to those of the 

 Black Currant and Hazel. The growth of the galls is 

 complete by the end of May, but the mite remains in 

 them till the following spring. They are dark green at 

 first, changing to reddish-brown or chocolate. When 

 this pest gets into a yew hedge, it may multiply to such 

 an extent as to have a stunting effect upon the hedge. 

 The same remedies apply as for the Yew-bud Galls and 

 the Black Currant Bud Mite. 



YEW, CHINESE. Podoca'rpus chine'nsis. 



YEW, CLUSTERED-FLOWERED. Cephalota' xus. 



YEW GALLS. See YEW-BUD GALLS. 



YEW, JAPANESE. Cephalota'xus peduncula'ta fasti- 

 gia'ta. 



YEW, JOINTED. Arthrota' xus. 



YEW, LORD HARRINGTON'S. Cephalota'xus pedun- 

 cula'ta. 



YEW, PRINCE ALBERT'S. Saxegothafa conspi'cua. 

 YEW, STINKING. Torre'ya. 

 YOKE ELM. Carpi'nus Be'tulus. 

 YOUTH AND OLD AGE. Yi'nnia. 

 YOUTH WORT. Dro'sera rotundifo'lia. 



YU'CCA. Adam's Needle. (Name of the plant in 

 Peru. Nat. ord. Lilyworts [Liliaceae]. Linn. 6-Hexan- 

 dria, i-Monogynia.) 



All whitish-flowered evergreens. Sometimes by seeds, 

 sown immediately they are ripe, in a slight hotbed ; 

 generally by suckers, but also, at times, from young 

 shoots that branch from the stems ; deep, dry, sandy 

 loam is their favourite soil ; a few require the assistance 

 of a stove or greenhouse, but most of them stand the 

 open air in England. Aloifo'lia is, perhaps, the tenderest 

 of all the hardy ones. They flourish near the sea- shore. 

 We may add, that they seem quite at home on a knoll, 

 or on rock-work. 



HARDY. 

 Y. acumina'ta (pointed-flowered) of Sweet. See Y. 



GLORIOSA ACUMINATA. 



acutifo'lia (acute-leaved). 4-5. White. Country un- 

 known. 1869. 



aletrifo'rmis (Aletris-like). 2. Cape of Good Hope. 

 1823. Greenhouse. 



aloifo'lia (Aloe-leaved). 2. August. S. United 

 States ; W. Ind. 1696. Greenhouse. 



Draco'nis (dragon's). 8. August. W. Ind. 1732. 



li'nea-lu'tea (yellow-lined). Mexico. 1863. 



pe'ndula (diooping-leaved). 12. August. 



,, ,, purpu'rea (purple). Leaves purple. Plant dwarf. 



serrula'ta (finely-sawed). 10. Carolina. 1808. 



tri'color (three-coloured). Leaves edged with 

 cream and red. 



variega'ta (variegated-leaved). 2. August. 



angustifo'lia (narrow-leaved). 2. July. Missouri. 

 1811. 



,, stri'cta (upright). 2-3. Arkansas. 1817. 



arcua'ta (bowed). See Y. ALOIFOLIA. 



argo'spatha (silver-spathed). 2-3. White. Country 

 unknown. 1868. 



bacca'ta (berried). 8-10. White. Fruit purple. 

 Mexico. 1870. Greenhouse. 



,, circina'ta (curled- threaded). Leaves with copious 

 coiled threads. 



austra'lis (southern). Mexico. 1876. Greenhouse. 



fragili<o'lia (fragile-leaved). 



Boerhaa'vii (Boerhaave's). Mexico. 1870. Green- 

 house. 



brevifo'lia (short-leaved). Mexico. Greenhouse. 



canalicula' ta (channelled). See Y. TRECULEANA. 



,, circina'ta (curled-threaded). See Y. BACCATA. 



,, conca'va (hollow-leaved). See Y. FILAMENTOSA CON- 



CAVA. 



conspi'cua (conspicuous). See Y. ALOIFOLIA. 



constri'cta (constricted). 8-10. White. Mexico. 



1862. Greenhouse. 



cornu'ta (horned). See Y. TRECULEANA. 

 cremda'ta (scolloped). See Y. ALOIFOLIA SERRULATA. 

 desmetia'na (Desmetian). Mexico. 1868. Green- 

 house. 



Draco'nis (dragon). See Y. ALOIFOLIA DRACONIS. 

 Ehrenbe'rgii (Ehrenberg's). Mexico. 1861. 

 ela'ta (tall). 8-12. White, fragrant. Mexico. 1889. 

 ,, ,, a'lbo-margina'ta (white-edged). 

 Engelma'nni (Engelmann's). See Y. WHIPPLEI. 

 ensifo'lia (sword- leaved). See Y. GUATEMALENSIS. 

 exi'gua (slender). See Y. FILAMENTOSA EXIGUA. 

 falca'ta (sickle-shaped). See Y. FLEXILIS FALCATA. 

 ftiamento'sa (thready). 2. September. Virginia. 



1675. " Silk Grass." 

 antwerpe'nsis (Antwerp). See Y. ORCHIOIDES 



MAJOR. 

 ,, au'reo-variega'ta (golden-variegated). Leaves with 



bright yellow bands. 1884. Greenhouse. 

 conca'va (hollow), i. Leaves concave. August. 



1816. 

 eii'gua (slender). White, green. S. United States. 



1873- 



fla'ccida (flabby). 2. Leaves recurved. 1816. 

 glauce'scens (sea-green). 2. Leaves glaucous. 



July. N. Amer. 1819. 

 grandiflo'ra (large-flowered). See Y. FILAMENTOSA 



MAXIMA. 



ma'jor (larger). See Y. FILAMENTOSA MAXIMA. 

 ,, ma'xima (largest). Flowers 2^-3 in. long. 1873. 

 orchioi'des (orchid-like). See Y. ORCHIOIDES. 

 ,, ,, pube'rula (finely-downy). Inflorescence downy. 



August. 



,, ,, variega'ta (variegated-leaved). 2. September. 

 fili'fera (thread-bearing). 10-50. Mexico. 1826. 



Greenhouse. 



