GENUS IRIS. 



705 



Differentiation of the Starches of the Genus Iris. Continued. 



Histological Characteristics. Contimieil. 

 Hilum Form, A'umber, and Position. Continued. 



/. pumila var. cyanea: Form the same as in /. piillida 

 var. speciosa. Position iLsually eccentric about 

 0.16 to 0.10 of longitudinal axis. 



/. bismarckiana: Form fairly distinct round or lenticu- 

 lar spot, or cavity sometimes. 4 hila may be 

 present. Hilum seldom fissured. Position usually 

 eccentric 0.25 to 0.14, commonly 0.16, of longitud- 

 inal axis. 



/. iberica: Form distinct round spot or cavity; some- 

 times 2 hila; usually not cleft. Position eccentric 

 usually from 0.20 to 0.14, commonly 0.20, of 

 longitudinal axis. 



/. xiphium var. Grand Tresoricr: Form distinct round 

 spot or cavity, often ilceply and irregularly cleft; 

 clefts in form of double-branched roots, irregular 

 cross, flying-bird or dragon-fly type. Position 

 usually eccentric, 0.40 to 0.33, commonly 0.40, of 

 longitudinal axis. 



/. xiphium var. Wilhelmine: Form distinct round spot 

 or deep cavity, often cleft; clefts deep, ragged, 

 irregular, forming a diagonal cross, flying-bird, or 

 dragon-fly type, or a branched, root-like figure. 

 Position usually eccentric 0.40 to 0.33, commonly 

 0.40. of longitudinal axis. 



/. xiphium var. lusilanica: Form distinct round spot or 

 cavity, often cleft either by a straight transverse 

 or diagonal or 2 or more forming a cross or flying- 

 bird tj'pe. Position usually eccentric 0.40 to 0.33, 

 commonly 0.40, of longitudinal axis. 



/. tingitana: Form distinct round spot or cavity, often 

 fissured; clefts often ragged and form a branched 

 root-like figure, or a diagonal or transverse cross, 

 or flying-bird type. Position usually eccentric 

 0.40 to 0.25, commonly 0.33, of longitudinal axis. 



/. reticulala: Form distinct round spot or cavity, often 

 fissured; clefts irregular and ragged, but sometimes 

 form a cross. Position usually eccentric slightly 

 or 0.40 to 0.33, commonly 0.40, of longitudinal 

 axis. 



/. hislrio: Form distinct, round spot or cavity; some- 

 times 2 hila. Often fissured, clefts usually ragged 

 and in form of a cross, flying-bird, or dragon-fly 

 type, or a branching root-hke form. Position 

 usually eccentric 0.40 to 0.33, commonly 0.40, of 

 longitudinal axis. 



/. alala: Form distinct round spot or cavity; sometimes 

 3 hila; may be fissured; clefts usually arranged in 

 twos or threes, or in irregular stellate fashion. 

 Position usually eccentric 0.40 to 0.25, commonly 

 0.33, of longitudinal axis. 



/. caucasica: Form distinct round or oval spot or cavity. 

 Sometimes 4 or more liila. Often fissm-ed; clefts 

 commonly diagonal; sometimes a cross or root- 

 like arrangement. Position usually eccentric 

 slightly to 0.33, commonly 0.40, of longitudinal axis. 



LamelloB -General Characteristics and Number. 



I. florentina: Rather coarse, generally not very distinct, 

 complete and incomplete, 2 sets sometimes, rings 

 around hilum, outer lamellaj follow outlines of 

 grains. 13 to 21 on larger grains. 



/. pallida var. speciosa: Indistinct, rather coarse com- 

 plete rings near hilum; distally irregular and 

 probably incomplete. Rarely 20 on larger grains. 



/. pumila var. cyanea: Indistinct, usually fine complete 

 rings near hilum; distally irregular and probably 

 incomplete. 28 to 32 on larger grains. 



I. bismarckiana: Fairly distinct, rings around hilum or 

 otherwise the same as in /. florentina. 10 to 16 on 

 larger grains. 



/. iberica: Not distinct, impossible to determine charac- 

 ter. Xumber not determined. 



Histological Characteristics. Continued. 



LamelloE General Characteristics and Number. Cont'd. 



/. xiphium var. Grand Tresorier: Not distinct, a few very 

 coarse lamella; visible. Number not determined. 



/. xiphium var. Wilhelmine: Usually visible, some coarse 

 lamellte occa.sionally seen which have the shape of 

 the outline of the grain. Number not determined. 



/. xiphium var. lusitanica: Not distinct, some coarse 

 lamellae visible. Number not determined. 



/. lingilana: Often invisible, when seen rather coarse, and 

 have the form of the grain. When can be counted, 

 14 to 19 on medium-sized grains; 38 on larger. 



/. reticulata: Rather fine, distinct, complete regular rings 

 at hilum, probably incomplete, and follow margin of 

 grain when distal to hilum. 22 on fair-sized grains. 



/. hislrio: Indistinct, one-third distance from hilum; 

 coarse and follow shape of grain when distal to 

 hilum. Number not satisfactorily determined. 



/. alnla: Fairly distinct, rather coarse complete regular 

 rings around hilum; often indistinct for one-third 

 of the distance from hilum, but distinct bei'ond. 

 25 on larger giains. 



/. caucasica: Often not distinct throughout, sometimes 

 coarse complete regular rings or ellipses near the 

 hilum, probably have the shape of the grains 

 when located at and beyond the hilum. 20 on 

 larger grains. 



Size. 



I. florentina: From 6 to 30^, commonly 18m- 



/. pallida var. speciosa: From 4 to 32/i, commonly 16/j. 



I. putnila var. cyanea: From 3 to 40/i, commonly 30;i. 



/. bismarckiana: From 4 to 26m, commonly IS/i. 



/. iberica: From 4 to 28m, commonly 18^. 



/. xiphium var. Grand Tresorier: From 4 to 36m, com- 



morjy 24m. 

 /. xiphium var. Wilhelmine: From 4 to 34m, commonly 



26m. 

 /. xiphium var. lusitanica: From 3 to 3Sm, commonly 



24m. 

 I. tingitana: From 4 to 50m, commonly 30m. 

 /. reticulata: From 4 to 46m, commonly 30m. 

 /. hislrio: From 3 to .36m, commonly 36m. 

 /. alata: From 4 to 50m, commonly 33m. 

 /. caucasica: From 9 to 49m, commonly 26m. 



PoLARiscopic Properties. 



Figure. 



I. florentina: Eccentric, distinct, usually irregular; lines 



fine, often bent, sometimes bisected. 

 7. pallida var. speciosa: Same as in /. florentina, but 



centric figure more frequent and lines more often 



straight. 

 /. pumila var. cyanea: Same as in /. florentina, but the 



lines more often bent. 

 I. bismarckiana: Same as in I. florentina, but figure more 



irregular. 

 I. iberica: Same as in I. florentina, but figure less irregular. 

 /. xiphium var. Grand Tresorier: The same as in /. 



florentina, but less irregular and more clean-cut. 

 I. xiphium var. Wilhelmine: Same as in /. xiphium var. 



Grand Tresorier. 

 I. xiphium var. lusitanica: Same as in I. xiphium var. 



Grand Tresorier. 

 I. tingitana: Same as in 7. florenlina, but more distinct 



and regiilar. 

 7. reticulata: Same as in 7. florentina, but more distinct 



and regular. 

 7. histrio: Same as in 7. florentina, but more distinct. 

 7. alata: Same as in 7. florentina, but more distinct and 



less irregular. 

 7. caucasica: Same :is in 7. florentina, but more distinct 



and less irregular. 



