Gypsum 



( 396 ) 



Hacquetia 



such prodigal fashion 

 allowed to remain on 

 seriously weakened. 



Principal Species : 

 cerastioides, 34', My., 



per., wh. 

 elegans, 6", sum., aim. or 



per., wh. 

 pauiculata, 2' to 3', Je., 



Other Species : 

 fastigiata, 1', Jy., per., 



pale red 

 glauca, 1J', Jy., per., wh. 



that if the flowers are 

 for long the plants are 



Aug., per., wh. ; root- 

 stock fleshy. 



flore pleno, 3', Je., 

 per., wh. ; a handsome 

 double var. 



repeus, C", per., wh. (see 

 p. 395). 



perfoliata, 2' to 3', Jy., 



per., pk. 

 Stevenii, 1' to 2', Jy., 



per., wh. or ro. 



HAHEXAUIA CAUNEA. 



GYPSUM. 



_ Chemically, gypsum is known as sulphate of 

 lime, but it is better known as plaster of Paris. 

 Its chief use to the gardener or farmer is as an 

 absorbent of ammonia, which is a valuable but 

 volatile fertiliser, given off freely during the de- 

 composition of almost all animal manures. A thin 

 layer of gypsum placed over the newly-turned 

 manure heap not only makes decomposition slower, 

 but prevents waste, because when dug into the 

 soil it slowly gives to the land the nitrogenous 

 fertiliser which it previously absorbed in the form 

 of ammonia. 



HABENARIA. 



Description. A genus of upwards of 400 species 

 of Orchid! (nrd. Orchidaceso). Many of the hardy 

 species are beautiful, including the 'British bifolia 

 and its forms. They arc gems for nooks in the 

 rock garden. Comparatively few of the stove 

 species are cultivated. The" genera Coeloglossum, 



Gynmadenia, Phyllostaehya, and Platanthera are 

 now merged in Habenaria. The plants are all 

 terrestrial. 



Propagation. By division of the rootstocks after 

 growth has finished for the season, or before it 

 starts again in the spring. The divisions of the 

 hardy species should be potted singly into small 

 pots, and kept in a cold frame until they start. 

 With the stove species a close propagating- case 

 is necessary. 



Soil. -Fur the stove species, two-thirds of peat, 

 one-third of good fibrous loam, and a little live 

 sphagnum, chopped, with sand. For the hardv 

 >(>rrics. liirht and peatv. 



Principal Species and Varieties : 

 bifolia (the Butterfly Helleborina, Sep., St., 



Orchis), I', Je., My., 



wh., native : many 



vars. The chlorautha 



section, by some botan- 

 ists considered to belong 



to a distinct species, has 



larger flowers, 

 carnea, 10", sum., pk. 



(see figure). 



irivosa (XI/H . alba), wh. 

 decipieus, Sep. to Nov. 



grn 



flesh 



(<///. longicalcarata). 

 flmbriata, 1' to 1J', sum., 



hdy., HI pur. 



Other Species : 

 Bleplmriglottis, My., Je., 



hdy., wh., fringed. 

 Candida (see subpubens). 

 ciliaris, 1 J- ' to 2 ' , hdy. , or. , 



yel. 

 oristata. 1', late spr., hdy., 



gold, yel., lip fringed, 

 dilatata, 1' to 2', sum., 



hdy., wh. 



gigantea (fee Susaunfe) . 

 Hookeri, 6" to 12", Jc., 



hdy., gra., wh., twenty 



to thirty flowers on a 



srtike. 



pk. (.11/11. 



Eulophia Helbborina). 

 Lugardii, 2", early sum., 



wh. spurs 6" ling, 

 milituris (w pusilla). 

 pusilla, r,sum. , aut. , sc., 



grn. (.(/. militaris). 

 rhodocheila, 9" to 10", 



Aug., grh., sepals grn.. 



lip bright cinnabar 



red. 

 Susanna;, 4", Jy., st., 



grn,, wh., fragrant (//. 



gigantea). 



psycodes, 10" to 12", Je., 

 hdy., ro., criin. ; re- 

 sembles flmbriata, but 

 has smaller flowers, 



rotundifoh'a, 1'.' to 3', 

 sum., hdy., ro., pur., 

 lip wh. 



salaecensis, 12" to 14", 

 Ap., st., grn., re;l, or. 

 tipped spur, roots 

 tuberous. 



subpubens, 1', Aug., st., 

 wh. (",'/. Candida). 



Heldreichii is now re- 

 ferred to Rainondia 

 Heldreichii. 



HABERLEA. 



A pretty herbaceous rockery perennial (ortl. 

 Gesneracese), resembling a small Gloxinia in 

 appearance, the flowers being borne amidst a tuft 

 of leaves. Propagation, by seeds and by division 

 of the crowns in spring or autumn. Soil, peaty. 

 Only Species: 



rhodopensis, 4" to 6", 

 Ap., hdy., pale lil., 

 wants a little protec- 

 tion in cold places. 

 HABLITZIA. 



A small and unimportant genus (ord. Cheno- 

 podiacese) of one species only tamnoides, July. 

 October, green a tall, hardy, climbing herb of 

 straggling appearance. Propagation, by division 

 of the root, or by seeds, in spring. Ordinary garden 

 soil. 



HABROTHAMNUS (MC CESTRUM). 



HACKBERRY. 



A popular name given to the fruit of Celtis 

 crassifolia. (Xee CELTIS.) 



HACQUETIA. 



A hardy perennial plant (nrd. Umbellifera:), 

 rather curious, but distinct and pretty. It is 



Jlahrantlnts (.t;'c Uijipeastrmn and Zepliyrantlies). 



