LARIX 



LASTREA 



1823 



with pyramidal, later often irregular, head: bark dark 

 grayish brown: branchlets slender, glabrous, yellowish: 

 Ivs. compressed, triangular, soft and obtuse, bright 

 green, M-1J4 m - long: pistillate fls. purplish: cones 

 %-\y<i in. long, with many almost orbicular scales, 

 usually puberulous, or glabrous on the back, loosely 

 appressed at maturity. N. and Cent. Eu. F.E. 29: 117. 

 H.W. 1:3, pp. 108-112. M.D.G. 1908:316, 317. G.W. 

 9, p. 512. Gt. 20:684, fig. 3. B.H. 22:7, fig. 1. Var. 

 pendula, Koch (L. europxa var. pendula, Lawson. L. 

 americdna var. pendula, Loud.). With pendulous 

 branches; sometimes confounded with the American 

 larch. Gt. 20:684, fig. 11. B.H. 22:8, fig. 1. Gn. 35, 

 p. 245; 39, p. 84. Var. fastigiata, Koch (L. europxa var. 

 fastigidta, Beissn.). Of columnar habit. Var. virgata, 

 Hayek (L. europtea var. virgata Hempel & Wilhelm). 

 Branches long and tortuous, very sparingly branched. 

 M.D. 1905:10. H.W. 1, p. 113. A hybrid of this and 

 the preceding species has been received from Dunkeld, 

 Scotland, and is now growing at the Arnold Arboretum. 

 It is of vigorous growth, but has not yet produced 

 cones. 



sibirica, Ledeb. (L. europsea var. sibirica, Regel, and 

 var. rossica, Regel). Tree, to 120 ft., with straight 

 slender st. and rather short ascending branches: branch- 

 lets yellow: buds grayish brown and dark brown or 

 nearly black at the base: Ivs. linear, 1-1 ^ in. long: 

 pistillate fls. usually green, sometimes whitish or brown- 

 ish: cones ovate-oblong, usually 1^ in. long; scales 

 fewer and larger than in the preceding species, finely 

 tomentose on the back, half-spreading at maturity. 

 N. E. Russia to Siberia. Gt. 20:684, figs. 1,2. B.H. 

 22:7, figs. 2, 3. 



cc. Scales glabrous, striate, straight at the apex, half- 

 spreading at maturity, usually rather few. 



laricina, Koch (L. americana, Michx. L. micro- 

 cdrpa, Desf. L. pendula, Salisb.). TAMARACK. HACK- 

 MATACK. Tree, to 60 ft., with horizontal branches, 

 forming a narrow pyramidal head, sometimes broad 

 and open on older trees; bark reddish brown: branchlets 

 slender, glabrous, reddish yellow, often bloomy: buds 

 reddish brown: Ivs. like those of the former, but of light 

 bluish green color: cones small, oval or almost globular, 

 H-^in. long; scales few to 20, almost orbicular and 

 entire, glabrous. Canada, south to Pa., west to 111. 

 and Manitoba. S.S. 12:593. Em. 106. Gt. 20:684, 

 fig. 7, 8. B.H. 22:10, figs. 2, 3. 



dahftrica, Turcz. (L. Cajdnderi, Mayr). Tree, to 70 

 ft., of fairly regular habit while young, old trees usually 

 irregular with wide-spreading branches: branchlets 

 bloomy: buds yellowish brown, darker or nearly black 

 at the base: Ivs. linear, about \]/i in. long: cones small, 

 %-l in. long; scales orbicular or ovate, rounded or 

 emarginate at the apex, lustrous, about 20 or more. 

 E. Siberia. Gt. 20:684, figs. 9, 10. B.H. 22:9, figs. 5, 6. 

 Var. Principis Rupprechtii, Rehd. & Wilson (L. Prin- 

 cipis Rupprechtii, Mayr). Cones larger, to 1^ in. 

 long; scales more numerous, truncate at the apex; 

 bracts at least on the lower part of the cone more than 

 half as long as the scales. N. China. G.W. 10, p. 566. 



L. chinensis, Beissn. =L. Potaninii. L. Griffithii, Hook. f. & 

 Thorns. Pyramidal tree, to 60 ft., with spreading and pendulous 

 branches: Ivs. soft, obtuse: cones 2-3 in. long, oblong, with exserted 

 and reflexed bracts. Himalayas. F.S. 12: 1267-68. R.H. 1868, p. 371. 

 Gt. 20:685, figs. 1-4. B.H. 22: 10, figs. 4-7. G.C. II. 25:719; 26:465; 

 111.41:130, 131. B.M. 8181. L. Kaempferi Carr.=Pseudolarix 

 Kaempferi. L. Kaempferi, Sarg.=L. leptolepis. L. kurilensis, 

 Mayr (L. dahurica japonica, Regel). Allied to L. leptolepis, to 70 

 ft.: branches wide spreading; young branchlets deep bluish red, 

 puberulous: Ivs. rigid: bracts as long or somewhat shorter than 

 scales. N. Japan. S.I. F. 2:1. G.W. 6, p. 499 (habit). L. 

 Lyalli, Parl. Allied to L. occidentalis, but lower: young branch- 

 lets tomentose: Ivs. quandrangular: young cones deep purple, the 

 scales with fringed margin. Brit. Col. to Wash. S.S. 12:595. G.C. 

 11.25:653; 111.23:357. Gt. 20:685, figs. 11-13. B.H. 22:9, figs. 

 L-3. M.D.G. 1905: 129 (habit). L. Mastersidna, Rehd. & Wilson. 

 Allied to I,. Griffithii. Tree, to 60 ft. : Ivs. bright green, %-l H'm. 

 long: cones about \ 1 A in. long: bracts long exserted and reflexed, 

 gradually narrowed into a mucro. W. China. L. olgensis, Henry. 



Allied to L. kurilensis, but scales pubescent. Amurland. L. Pota- 

 ninii, Bat a). (L. chinensis, Beissn. L. thibetica, Franch.). Allied to 

 L. occidentalis. Tree, to 80 ft.: branchlets glabrous: Ivs. acute or 

 obtusish, about 1 in. long: cones oblong-ovate, 1-2 in. long: bracts 

 lanceolate, exceeding the nearly orbicular scales; scales spreading 

 at maturity. W. China. G.C. III. 39: 178. L. thibetica, Franch.= 

 . otaninu. ALFRED REHDER. 



LARKSPUR: Delphinium. 



LASIA (Greek, rough or prickly, referring to the 

 aculeate caudex, scape and foliage). Arace.se. Two 

 perennial herbs, woody at the base, allied to Dracon- 

 tium and Cyrtosperma, not tuberous, with a more or 

 less decumbent caudex, native in E. India, Ceylon, 

 Java, Cochin-China. L. spinosa, Thwaites (Dra- 

 contium spinosum, Linn. Pdthos spinosus, Ham. 

 Ldsia heterophylla, L. Zollingerii, L. Jenkinsii, L. 

 Hermannii and L. desciscens, Schott), is offered abroad. 

 It is a glasshouse subject: caudex about \% in. thick, 

 prickly: petioles 9-18 in. or more long, prickly; blade 

 variable in shape, hastate or entire, or deeply pedately 

 pinnatipartite: spathe 6-10 in. long, the upper part 

 rolled into a tail-like extension, the open or spadix- 

 bearing part short. E. India. L, g. g. 



LASIAGROSTIS: Stipa. 

 LASIANDRA: Tibouchina. 



LASTHENIA (name of a woman who was a 

 pupil of Plato). Compdsitie. Low, slightly succulent 

 annuals, glabrous or only puberulent, with opposite 

 Ivs. and numerous inch-wide heads of yellow fls. in 

 early summer: rays 5yl5; receptacle conical or even 

 subulate, with projecting points bearing the narrow 

 flattened achenes; pappus none, or of 5-10 scales: 

 involucral bracts making a bell-shaped or hemispherical 

 cup. Species about 6. Ore. and Calif., and Chile. 



glabrata, Lindl. (L. califdrnica, Lindl. Hologymne 

 glabrdta, Bartl.). Height about 1 ft.: Ivs. linear 

 or lanceolate, usually 1-4 in. long, some sheathing at 

 base: peduncles long, somewhat enlarged below the 

 erect head; pappus none. Calif. B.M. 3730. B.R. 

 1780, 1823. The plant cult, under this name is likely 

 to be Baeria gracilis, which see. In Lasthenia the 

 bracts of the involucre are united to form a green cup 

 with toothed border, while in Baeria the bracts are not 

 Umtedi HARVEY MONROE HALL. 



LASTREA (C. J. L. Delastre, Austrian botanist). 

 Polypodidcese. A name commonly used in the trade, 

 especially in England, for species of Dryopteris. Also 

 spelled Lastrasa. On the basis of priority it has no claim 

 to recognition, as it was established by Bory in 1824, 

 while we have Nephrodium, 1803; Aspidium, 1801; 

 Tectaria, 1800; Polystichum, 1799, and Dryopteris, 

 1763. 



The following additional species properly classified 

 under Dryopteris (Vol. II, p. 1078) are in the American 

 trade under the name Lastrea (the combinations are 

 for Dryopteris, not Lastrea) : 



A. Lowest pinnae, reduced to auricles: texture thin. 



sancta, Kuntze. Lvs. 6-9 in. long, 1-2 in. wide on 

 short slender stalks; lower pinnae very much reduced; 

 under surface glandular. W. Indies. 



palustris, Kuntze. Lvs. 2-3 ft. long, 8-12 in. wide, 

 on long straw-colored stalks; lower pinnae reduced, the 

 upper %in. wide, cut down to the rachis into linear- 

 oblong lobes. Brazil. 



montihia, Kuntze. Lvs. 1^-2 ft. long, 6^8 in. wide; 

 lower pinnae greatly reduced to mere auricles; upper 

 pinnae 1 in. wide, cut into close blunt lobes. Eu., W. 

 N. Amer. A var. cristato-gracile is also cult. 



AA. Lower pinnae scarcely reduced: texture firm. 

 rigida, Kuntze. Stalks stout, densely scaly: lf.- 

 blades 1-1 % ft. long, 4-6 in. wide, oblong-lanceolate, 



