168 



HENDERSON'S HANDBOOK OF PLANTS 



GLA 



with a syringe, which sufficiently covers up 

 all flaws in the glass to prevent burning, and 

 at the same time tends to cool the house from 

 the violence of the sun's rays. This is by far 

 the cheapest and best shading we have ever 

 used. It can be graded to any degree of 

 thickness, and costs only about twenty-five 

 cents per thousand square feet of glass, for 

 material and labor. 



In glazing, the method now almost univer- 

 sally adopted is to bed the glass in putty, and 

 tack it on top with glazier's points, using no 

 putty on the top. The glazier's points are 

 triangular, one comer of which is turned 

 down, so that, when it is driven in, it fits the 

 lower edge of each pan* and prevents it from 

 slipping down. A great mistake is often made 

 in giving the glass too much lap. It should 

 only be given just enough to cover the edge 

 of the pane (from one-eighth to one-fourth of 

 an inch). If given too much, the water gets 

 in, and when it freezes it cracks the glass. 



All who have had experience with green- 

 houses know that, no matter how well the 

 glazing has been done by bedding the glass in 

 putty, the water gets in at the crevices sooner 

 or later, rotting the putty, and, conse- 

 quently, loosening the glass. A simple plan to 

 obviate this (which has recently been intro- 

 duced) is to pour along the junction of the 

 bar with the glass a thin line of wliite lead in 

 oil from the slender spout of a machine oil 

 can, over which is shaken dry sand. This at 

 once hardens, and makes a cement which 

 effectually checks all leakage. This, carefully 

 done, will make such a tight job that no 

 repairs will be necessary for many years. 



Glassvrort. See Salicomia, 



Glastonbiiry Thorn. CratoEgus oxyacantha pr(F- 

 cox. A very early rtoweriijg variety of the 

 Hawthorn. 



Glaucesceut. Having a bluish-green or sea- 

 green appearance. 



Gla'ucium. Horned Poppy. From glaukos, 

 grayish green; referring to the color of the 

 leaves. Nat. Ord. Papaveracem. 



A genus of hardy annuals and perennials, 

 natives of Europe. They are remarkable for 

 their bright yellow flowers, that are produced 

 in great abundance all the summer, and for 

 their deeply cut leaves, that have a decided 

 glaucous hue. G. luteum, one of the most 

 showy and desirable species, is very common 

 at Montauk Point, Long Island, and on the 

 islands along the coast, having IJecome natu- 

 ralized from Eui'ope. This species grows 

 readily from seed, and makes a valuable plant 

 for the ribbon border. 



Glaucous. Covered with a fine bloom, like that 

 of the Plum or Echeveria aecunda glauca. 



Gla'ux. Sea Milkwort. A pretty little native 

 herbaceous perennial belonging to Primulacece. 

 G. Maritima, the only species, grows abun- 

 dantly on most parts of the sea-coast, just 

 above high-water mark, and in salt marshes. 

 The stems are clothed with oblong, fleshy, 

 smooth, entire leaves, which are pale under- 

 neath, and salt to the taste. The flesh-colored 

 flowers are solitary, nearly sessile, and axil- 

 lary. 



Glazing. See Glass. 



Glecho'ma. Now included under Nepeta, which 

 see. 



GLO 



Gledi'tschia. Honey Locust. In honor of 

 Gottlieb Gleditsch, once a professor at Berlin; 

 a defender of Linneeus against Siegesbeck, 

 and author of many botanical works. Nat. 

 Ord. LeguminoacB. 



A genus of handsome hardy deciduous 

 trees, several of the species being common in 

 the Middle, Southern and Western States. G. 

 triacanthos, the Three-thomed Acacia or com- 

 mon Honey Locust, is a common and very 

 ornamental shade tree with elegant foliage. 

 Its wood is heavy, hard, strong and compact, 

 capable of a high polish, and very durable in 

 contact with the soil. From its strong and 

 abundant thorns it is very valuable, and is 

 much cultivated as a hedge plant. 



Gleiche'nia. Named after Gleichen, a German 

 botanist. Nat. Ord. Polypodiacew. 



An extensive genus of Ferns found widely 

 scattered in the tropics, both of the Old and 

 New Woi'ld, and extending to Chili and the 

 Australasian regions. A few only have found 

 their way into the hot-house, some of whicli 

 are among the most elegant and graceful of 

 the cultivated Ferns. They are propagated 

 by division or from spores. Introduced in 

 1823. 



Gleichenia'ceae. A group or sub-order of Filices. 



Glo'bba. Native Molucca name. Nat. Ord. 

 Zingiberacece. 



A genus of about twenty-four species of 

 pretty plant-stove, herbaceous perennials, 

 natives of India and the Malayan Archipelago. 

 Flowers yellow or pinkish, very curious look- 

 ing. Of easy culture in a warm green-house ; 

 increased by division. 



Globe Amaranth. See Gomphrena globosa. 



Globe-Daisy. Globularia vulgaris. 



Globe-Flo-vver. The genus Trollius, which see. 

 Swamp. Cephalanthus occidentalis. 



Globe-Thistle. The genus Echinops, which see. 



Globose, Globular. Eound or spherical. 



Globula'rla. From globulos, a small round 

 head ; in allusion to the form of the capitate 

 flower. Nat. Ord. Selaginacew. 



A genus of hardy or green-house perennial 

 herbs or shrubs inhabiting the Mediterranean 

 region, etc. Flowers collected upon a com- 

 mon receptacle surrounded by a many-leaved 

 involucre. Pretty plants for the rock garden 

 or herbaceous border; propagated by seeds 

 or by division. 



Globule'a. From globulos, a small globe ; re- 

 ferring to the glands on the petals. Nat. 

 Ord. C'raNsiihiceCB. 



A genus of succulent plants, natives of the 

 Cape of Good Hope, with flat, sickle-shaped 

 leaves, arranged in a rosette. The flowers 

 are small, arranged in dense clusters, and 

 have five petals bent inward, each of them 

 tipped with a little globule of waxy matter, 

 whence the name of the genus, which is 

 closely allied to Crassula. The several species 

 are propagated by cuttings of firmish young 

 shoots, that should be dried a day or two be- 

 fore being put into the propagating bed. In- 

 troduced in 1732. 



Glomerate. Collected into close heads or 

 parcels. 



Glone'ria Jasminiflora. See Psychotria jaa- 

 minijlora. 



