SELEXIPEDIUM 



rather stiff uprig-lit, about 1 ft. Ioiik: si-ape 12-24 in. 

 higli, about 4-tld.: dorsal stpal.s 5-i.i in. lunj;, lanceolate! 

 pale yellow, verging on creamy wliite an<l veined witli 

 greenish, lower sepal similar; petals pendent, twisted, 

 often attaining a length of nearly a yard, vellowishi 

 shaded with brown on the outside and becoming brown- 

 ish crimson toward the tips. Peru. F.S. G:r.lJG. KH 

 1857, p. 31S; 1S83, p. 351; 1885, p. 472. G.C. II 3-2I1- 

 2C;:2fi9. 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 



1053 



'^^^ 



23J9. Seienipedium Dominianum (/l-.'i). 



— Onp of the largest of the Selenipedium.s and remark- 

 ahJe ou account of the extremely long petals. Peloric 

 forms with the third .^eptil (labelluin) rosenihling the 

 other two have p;issed under the name of CropccJ/inn 

 Lindeid, Lindl. 



Var. roseum, Hort. [S. cauddfimi. thy. IV" rsrtiririii, 

 Godfroy. ). Sepals yellow, with orange reins ; pctai>; 

 deep purple; labellum deep vellow in front, green he- 

 hind. I.H. 33:590. Var. W^lUsii, Hort. {S."W(nUsn, 

 Reichh. f. Cypripedhi ni Wi'U'sii, Hort.). Lvs. paler 

 green; fls. pale, and in ever_Y way more delicate than 

 the type. Gn. 4!h p. 140. Numerous other varieties of 

 this species are distinguished in cultivation. The fol- 

 lowing names occur in trade lists: aiireum, Luzemhur- 

 g^nse, rubrum, sup^rhum, Seegerii, splendens, nigres- 

 cens. 



15. grande, Reichh. f. {Cupriptdhim. ;7/y(;/c^. , Reichb. 

 f.). A garden hybrid between ..S'. Bcfizlii and /S'. ramla- 

 tum, resembling the former in habit and flowers ):iut 

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

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



shining tls.; sepals long, u))long- lanceohitc, yellowish 

 white, Vfiiicd with green; petals long, pi-iKh'nt, yellow- 

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

 greenish yellow in fro]it, whitish ))(hi]id; side -lobes 

 white, spotted with crinis.ui. G.M. 'A'2:H7. A.F. ll-A'.iV.i. 

 — Var. atr&,tum. A hylirid )!(:■[ ween ^'. lom/ifo/in „i , //av: - 

 //;'and 6'. caiidai/iiii rosrnin. (.;.C. HI. .lotflD^. 



ir.. Dominianum, Hort. [Capri judintu D<'iinin\'iiniii> , 

 Reichh. f. ). Fig. 2300. Lvs. nnnu-rous, about 1 ft. h.tng, 

 acuminate : fls. yellowish green, with Cupper - brow Ji 

 sluides and markings ; labellum deep leddish brown, 

 reticulated in front and yellowish green behind. A ]iy- 

 brid between 6'. Peareei and .S'. cfiiahifu ni . It is iuter- 

 mediate between the parents, hut differs from ,S. raiitla- 

 ftun- by its acute bracts and narrower lvs., from .s'. 

 Pearcei by the transverse staminude and hairy ovary. 

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

 also distinguished in cultivation: 61egans, rnb^scens, 

 superbum. 



17. Boissierianum, Reichh. f. {Cijpripediu}ii reticuld' 

 tnm, Reichh. f.). Plant of vigorous habit; lvs. about 3 

 ft. long, acuminater 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 tlie lip and with some brown spots on the 

 margins of tlic seyials: ovary dark brown, with green 

 apex and ribs; upper sepals li.gulate-lanceolate, very 

 crisp; lower sepals oblong, aliout 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.F. 4:G05. 



18. Klotzschi^Qum, Reichh. f. {Ci/pripediwm Sehom- 

 hitrgkianioij , Klotzsch and Reichh. f. ). Lvs. linear, 6- 

 12 in. long, scarcely % in. wide, rigid, keeled: scape 

 longer than the lvs., hirsute, purple, 2-3-fld.; dorsal 

 sepal ovate-lanceolate, pale rose-colored, with reddish 

 brown veins, the low'er ovate, boat-shaped, colored like 

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

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

 flexed side -lobes wliitisli, spotted. British Guiana. 

 B.M. 7178. G.C. HI. 15:025. 



19. caricinum, Reichh. f . ( Ci/prlpediiim Ptarcei, 

 Hort. Cijpriped'mm ca)-ir}nuiii . Lindl. & Paxt.) Lvs, 1 

 ft. long, springing in sedge-like tufts from the long 

 creeping rhizome: scape longer than the lvs., 3-6-fid. : 

 fls. mostly pale greenish, with the segments bordered 

 with white and having purple tips; sepals broadly ovate, 

 waved, as long as the lip; petals more than twice as 

 long, pendent, narrow and much twisted; labellum ob- 

 long, the upper margins fiat ; staminodium provided 

 with 2 hairy processes. Pern. B.M. 5460. F.S. 16:1648. 



Heineich PIasselbeino. 

 SELF-HEAL. SeeBruneUa. 



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 and cultivation, self-sterility and sterility have be- 

 come important subjects in determining the value and 

 adaptability of new varieties to the various needs and 

 purposes of the planter. 



The study of self-sterility in more recent years has 

 been confined mostly to fruit trees and small fruits, 

 and has been conducted by a number of experiment 

 station workers. The list of self-sterile and unisexual 

 varieties is now fairly large for apples, pears, plums, 

 grapes and strawberries. In the case of peaches, apri- 

 cots, cherries, nectarines and prunes little has been done 

 to determine the number of self-sterile and partially self- 

 sterile varieties. The causes wdiicli teufl to i>roduce 

 self-sterility in cultivated plants may be briefly sum- 

 marized as follows : 



(1) Change <if i-uvironnient due to domestication pro- 

 duces change in tin- rcpriMhn.-ii\e organs of the plants, 

 It nnvy result {<i) in The suppression in whole or in part 

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

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

 changing the time of ripening of the polle]j and of tlie 

 receptivity of the stigma. 



(2) Asexual propagation tends to reduce the impor- 

 tance of seed production, and to transmit and fur- 



