S32 



IRIS 



98. Palaestina, Boiss. Lvs. 3-6 in. long: stem very 

 short: lis. pale yellow, tinged with lilac; outer seg- 

 ments oblong, upper % reflexed; claw auriculate; inner 

 segments minute, narrowly lanceolate. Fls. in winter. 

 Mts. of Palestine. Very near /. Caucasica, but dis- 

 tinguished by its longer acuminate spathes and the color 

 of the fls. 



99. alata, Poir. (/. scorpioldes, Desf.). Lvs. about 6, 

 plane, 6-9 in. long: stem very short: outer segments 

 3-4 in. long, obovate-cuneate, bright lilac, variegated 

 with white, and having a yellow keel down the claw; in- 

 ner segments obovate-unguiculate, spreading from the 

 base of the outer: style crest large, laciniately toothed. 

 Winter flowering. Plants very dwarf. Spain to Sicily 

 and Algeria. B.R.22:1876. Gn. 10, p. 579 and 54, p. 102. 

 G.M. 35:614. 



100. Caucasica, Hoffm. Lvs. about 6 : stem short: 

 fls. pale or bright yellow; outer segments with an ovate 

 blade and a very broad rhomboidal claw, with small au- 



1181. Iris orchioides (X%). 

 A good species for pots. 



ricles and a toothed or ciliated crest; inner segments 

 oblanceolate. Dwarfer habit than /. orchioides. Cauca- 

 sus to Asia Minor, etc. 



101. Jumdsa, Boiss. & Haussk. Lvs. about 10: stem 

 6 in. long: outer segments spatulate-oblanceolate, re- 

 curved above the middle, claw with a yellow crest; in- 

 ner segments minute, spatulate, toothed. The fls. are 



freenish yellow, shaded with smoky gray. Dry fields, 

 yria. 



102. orchioides, Carr. Fig. 1181. Lvs. about 6: stem 

 12-15 in. long, with distinct internodes: spathes l-fld.,2in. 

 long: fls. yellow; outer segments with an obovate blade, 

 and a purple blotch on each side of the crest of the claw; 

 inner segments oblanceolate, less than an inch long, and 

 generally sharply deflexed, with a long filiform claw. 

 Spring. Var. oculata, Maxim. Blade of the outer seg- 



IRRIGATION 



ments more spotted. Var. caerulea, Hort. Fls. brigLt 

 lilac, with a yellow blotch on the blade of the outer seg- 

 ments. Mts., Turkestan. B.M. 7111. Gn. 53, p. 482. 

 R.H. 1880, p. 337. 



Of the following names, which are found in catalogues, no 

 complete description is available: I. Assyrlaca. Bluish white. 

 /. augustlna. Deep yellow, marked with maroon. Gard. form 

 of I.variegata. I.Battandieri. White. Algeria. Bulbous. I. 

 Bosnlaca. Yellow. Rhizomatous. /. brachy siphon. Pale blue. 

 Rhizomatpus. /. Brittdnicus . Pale pink, with the outer seg- 

 ments veined with purple. Gard. form of I. squaleiis. /. 

 Candidna. Outer segments reddish purple ; inner segments light 

 lavender. Germanica. /. Coredna. Like I. Sibirica, early and a 

 free bloomer./, edlna. Light purple and violet. Var. of I. j 

 neglecta./. Eggeri. Blackish brown. Oncocyclus./. Fisheri. 

 Apogon. I. fldva. Pale yellow. Germanica./. Gladstoiiiana. 

 Hybrid of I. atropurpurea. Pale black.with yellow markings. 

 I. grdcilis, Lichten.=Mora9a tenuis. See also index given above. 

 /. ignititia, probably Ignacite, a form of I. neglecta. Lilac, with 

 the outer segment shaded purple. 7. liguldris. Purple. Ger- 

 manica./. monspur, Foster =1. Monnieri X I. spuraea. /. 

 nlgricans. Lvs. short ensiform: fls. dull black to deep black. 

 Distinct from I. atropurpurea by its uniform dark color and 

 dwarf foliage. Oncocyclus./. pdncrea, probably pancrace.var. 

 of I. variegata. Buff and purple./. pdvar.=I. paradoxaXI. 

 variegata./. Robinsonidna, F. Muell.=Morea Robinsoniana. 

 /. Rudini, Hort. , Herb. Fls. black-brown and claret. Said to be 

 stronger and more free-flowering than the other Oncocyclus 

 Irises./. Sikkimensis. Lilac. Rhizomatous. /. stenophylla. 

 This plant was discovered in the Cilician Taurus in 1895-6. 

 Haussknecht named it stenophylla without describing it. J.G. 

 Baker gives a short description inG.C. III. 27:170. Near I. Per- 

 sica. Lvs. 5-6, linear, tufted, channelled down the face, short 

 and stiffly erect at the flowering time: fls. springing from the 

 ground, the long tube lightly wrapped round by the lanceolate 

 spathe valves; outer segments 2 in. long; blade reflexed, black- 

 ish blue towards the tip, with many black spots on a pale 

 ground below it ; inner segments small, horizontal : style 

 branches lilac. Not in American trade. G.C. III. 27:171. Gn. 

 57:203. /. tuberbsa, Linn.=Hermodactyhis tuberosus. I.Vog- 

 elidna. Similar to I. Persica and I. Rosenbachiana, but earlier- 

 flowering. Fls. variable in color, silver-gray predominating, 

 with violet, rose or lilac markings. Var. grandiflora. Large- 

 flowering. 



The following numbers are not mentioned in catalogues of 

 American dealers. They are procurable through foreign grow- 

 ers, and are advertised in Dutch-American catalogues: I, 4, 5, 

 8, 29, 34, 38, 39, 40, 42, 51, 52, 53, 56, 58, 59, 62, 63, 64, 66, 67, 72, 80, 

 83, 84, 85, 86, 88, 89, 90, 91, 92, 93, 95, 96, 97, 98, 99, 100, 101, 102. 



H. HASSELBBING. 



IBIS-BOOT, or OBBIS-BOOT. Iris Florentine*. 



IRONBABE. Eucalyptus. 



IBONWEED. Weed. 



IBONWOOD, in America, Ostrya Virginica. 





IBBIGATION. Irrigation in its broadest sense In- 

 cludes all problems of collecting, storing, delivering, 

 and applying water to the land through the construc- 

 tion of dams, reservoirs, canals and laterals, and the 

 application of power when necessary to deliver the 

 water; while in a restricted horticultural sense it is a 

 method of cultivation, having for its object to increase 

 and regulate the water supply in the soil. 



In this latter sense Irrigation is a necessary practice 

 in the arid regions, and is advisable in the humid re- 

 gions in proportion to the intensity of the cultivation 

 and the value of the crop grown. Thus in Florida, with 

 an average of 60 to 70 inches of annual rainfall usually 

 well distributed Irrigation has been largely introduced 

 in the past few years for horticultural crops and even 

 for tobacco, as an insurance against loss or damage by 

 the occasional droughts. The first cost of a small Irri- 

 gation plant in Florida, for 20 acres or over, is said tc 

 be approximately $100 to $150 per acre; the interest on 

 which, and the necessary repairs, would amount to from 

 $5 to $10 per acre per annum. This is a small expendi- 

 ture to insure a crop against loss or injury where the 

 value per acre is so great as in many horticultural lines. 

 Irrigation is needed not only to prevent the actual death 

 of the plants, but to promote a uniform, rapid, and con- 

 tinuous growth, which is necessary for the development 

 of the finest texture or flavor of the commercial crop. 



King has shown that the value of a crop saved in Wis- 

 consin, such as the strawberry, in a season when tl 

 crops generally are injured by drought, may pay all the 

 expenses of the original cost of the Irrigation plant. 



