SELENIPEDIUM 



rather stiff upright, about 1 ft. long: scape 12-24 in. 

 high, about 4-fld.: dorsal sepals 3-0 in. lonu'. lanceolate, 

 pale yellow, vermin u' .'ii it^,iiii\ wliii.' mmI \ riih >1 with 

 greenish, lower sr 11 : i ' i ' ■ . -nd. 

 often attaining a I :.li, 



shaded with bro\sii 'm j n. >mm -,.,. ,m m- i.i ^u ii- 

 ish crimson toward the lip.,. I'elU. i'..S. I, .OOlj. li.Ii. 

 1857, p. 318; 1883, p. :i51; 1885, p. 472. U.C. II. 3;211; 

 26:269. Gn. 3,p.313; 26, p. 72; 32, p. 301; 46, p. 85. A.F. 

 3:132; 6:859. Gng. 5:265. G.M. 31:557; 33:795; 35:489. 



SELF -STERILITY 



1653 



^^^ 



23D9 Selenipedium Don 



(x: 



— One of the largest of the Selenipediums ind lennik 

 able on account of the extremely long pet il 1 i 1 1 

 formb with the third sepil (labellum) res( ml liii^ tli 

 other two have passed under the name ot / / ' 

 Lindeni Lindl 



Var rdseum Hort ( S eauddtiim xiv II / 

 Godfro\ ) '^epUs mellow with oi in.,i ^ iii | t li 

 deep purple 1 il ellum deep%elIow m tr iit _i n 1 

 hind I H SS j<)( \ ir W«hsii Huit ( s 11 ,11, 

 Eeichb f C,ji»ipedium nuUiKii Hort) L\ j. ilei 

 green fls pale and in every wa\ mere deluate than 

 the type Gn 49 p 140 Numerous other varieties of 

 this species are distinguished m cultivation. The fol- 

 lowing names occur in trade lists: ailreiim, Lozembur- 

 gfinse, rtibrum, sup6rbum, SeSgerii, splendens, nigr^s- 

 cens. 



15. grdnde, Reichb. f. (Ciipripedium grdnde, Reichb. 

 f. ). A garden hybrid between S. Rceslii and .S'. canda- 

 tum, resembling the former in habit .and flowers but 

 much more vigorous, with darker fls. : Its. dark green, 

 over 2 ft. long: scape over 3 ft. high, with several large. 



shining fls. ; sepals long, oblong - lanceolate, yellowish 

 white, veined with green ; petals long, pendent, yellow- 

 ish green above, becoming rose-pink; labellum large, 

 ijreenish vellow in front, whiti.sh behind; side - lobes 

 white, spotted with crimson. G.M. 32:87. A.F. 11:1349. 

 -Var. atratum. A hybrid between i'. lotujifotium.Rcez- 

 lii and S. caudatum roseum. G.C. 111. 15:692. 



16. Dominiinum, Hort. (Cypripedium DominiUnum, 

 Reichb. f.). Fig. 2309. Lvs. numerous, about 1 ft. long, 

 acuminate: fls. yellowish green, with copper -brown 

 shades and markings ; labellum deep reddish brown, 

 reticulated in front and yellowish green behind. A hy- 

 brid between ti. Pearcei and S. caudatum. It is inter- 

 mediate between the parents, but differs from S. cauda- 

 tum by its acute bracts and narrower lvs., from S. 

 Pearcei by the transverse staminode and hairy ovary. 

 Gn. 3, p. 491. F. 1874, p. 57.-The following varieties are 

 also distinguished in cultivation: Alegans, rub6scens, 

 sup6rbtiin. 



17. BoiSBieri&num, Reichb. f. (Cypripedium reticuld- 

 tum, Reichb. f.). Plant of vigorous habit: lvs. about 3 

 ft. long, acuminate: scape few-fld. or sometimes pani- 

 culate, 3-7-fld. : fls. of peculiar light green tints, with a 

 few sepia brown and green blotches on the whitish in- 

 flexed part of the lip and with some brown spots on the 

 margins of the sepals: ovary dark brown, with green 

 apex and ribs; upper sepals ligulate-lanceolate, very 

 crisp; lower sepals oblong, about equal to the labellum, 

 crisp petals spreading, long-linear, twisted and very 

 crisp on the margins. Peru. G.C. III. 1:143; 21:54, 55. 

 G J? 4 bOo 



18 Klotzschianum, Eeichb. f. {Cypripidlum Schom- 

 buiqkianum, Klotzsch and Reichb. f.). Lvs. linear, 6- 

 12 in 1 )n.;, scarcely }4 in. wide, rigid, keeled: scape 

 lonf,er tlun the lvs., hirsute, purple, 2-3-fld.; dorsal 

 sepal o\ ite-lanceolate, pale rose-colored, with reddish 

 brown veins, the lower ovate, boat-shaped, colored like 

 the upper one; petals 3!^ in. long, linear, twisted, col- 

 ored like the sepal; labellum greenish yellow, the in- 

 flexed side -lobes whitish, spotted. British Guiana. 

 B M 7178 G.C. III. 15:625. 



10 canclnum, Reichb. f. (Cypripedium Pearcei, 

 H It Cypripedium caricinum, Lindl. & Paxt.) Lvs. 1 

 tt long springing in sedge-like tufts from the long 

 Htpmg rhizome: scape longer than the lvs., 3-6-fld. : 

 11 mostlj pale greenish, with the segments bordered 

 \ ith white and having purple tips; sepals broadly ovate, 

 » ^^ed as long as the lip; petals more than twice as 

 1 11, pendent, narrow and much twisted; labellum ob- 



I ^ the upper margins flat; staminodium provided 

 h 2 h iiry processes. Peru. B.M. 5466. F.S. 16:1648. 

 Heinrich Hasselbring. 



SELF HEAL. See BruneUa. 



SELF STERILITY OF FRUITS. Self-sterility may 

 be roughly defined as the inability of a given plant to 

 produce fertile seeds when pollinated with its own pol- 

 len With the rapid strides in plant-breeding, propaga- 

 tion ind cultivation, self-sterility and sterility have be- 

 come important subjects in determining the value and 

 adiptihihty of new varieties to the various needs and 

 piiri f the planter. 



I II tn It of self-sterility in more recent years has 

 1 11 mined mostly to fruit trees and small fruits, 

 1 1 II l.een conducted by a number of experiment 

 1 ti II ^ rkers. The list of self-sterile and unisexual 

 X 111 ti IS now fairly large for apples, pears, plums, 

 _i [ ml strawberries. In the case of peaches, apri- 



t h 1 lies, nectarines and prunes little has been done 

 t (1 t ujiine thenumberof self-sterile and partially self- 

 sterile \ irieties. The causes which tend to produce 

 self sterility in cultivated plants may be briefly sum- 

 marized is' follows: 



{ 1 ) Change of environment due to domestication pro- 

 duces change in the reproductive organs of the plants. 

 It may result (n ) in the suppression in whole or in part 

 of either stamens or pistils; (6) in the infertility or 

 impotency of the pollen upon its own pistils; (c) in 

 changing the time of ripening of the pollen and of the 

 receptivity of the stigma. 



(2) Asexual propagation tends to reduce the impor- 

 tance of seed production, and to transmit and fur- 



