2922 



RETINISPORA 



REYNOSIA 



cultivation, each of them with an intermediate form 

 showing either a kind of foliage approaching that of the 

 type or two different kinds of foliage on the same plant. 

 There seems to be no doubt that all these forms have 

 been secured by propagating branches of young seed- 

 ling plants. All seedlings of Chamgecyparis, Thuja, and 

 other genera of the Cupressinese produce in their 

 juvenile state a kind of primordial foliage very different 

 in appearance from that of the adult plants. The first 

 leaves are always linear and spreading, passing grad- 

 ually into acicular and at last scale-like leaves. In some 

 plants, especially if they have not sufficient nourish- 

 ment, the primordial foliage is retained longer than 

 usual and these have probably been selected for per- 

 petuating the juvenile state, by means of cuttings. By 

 continuing through many generations the propagation 

 of those branches which show the juvenile state most 

 distinctly, these forms have become well-fixed varieties 

 and even sometimes bear seeds without changing the 

 foliage on the fruiting branches. These seeds, however, 

 produce plants of the typical form and only a few of 

 them retain the primordial foliage somewhat longer 

 than usual. 



The juvenile forms very much resemble some species 

 of Juniperus in habit and foliage. They bear linear 

 spreading leaves in pairs, changing in winter to a 



3369. Retinisporas. The specimen on the left is Thuya orien- 

 talis var. decussata; middle, Chamaecyparis thyoides var. eri- 

 coides; right, C. thyoides var. andelyensis. 



brown, reddish, violet or steel color, and do not show 

 the regular frond-like branching of the typical forms. 

 The leaves, however, are much softer and not sharply 

 and acutely pointed as in Juniperus; they are mostly 

 marked with whitish or grayish green lines beneath, 

 which is never the case in Juniperus. Only Thuya 

 orientalis var. decussata and some intermediate forms, 

 with acicular suberect leaves, show whitish marks on 

 the upper side of the leaves like Juniperus. 



Though these Retinispora forms are described under 

 the genera and species to which they belong, where also 

 references to illustrations are cited, descriptions are 

 given here to afford a closer comparison of these similar 

 and much confounded forms. The two forms of foliage 

 in the common red cedar are well shown in Fig. 2025, 

 Vol. III. For other pictures of Retinispora forms see 

 Chamaecyparis and Thuja. 



Chamaecyparis obtusa var. ericoides, Boehmer (Reti- 

 nispora Sdnderi, Sander. Juniperus Sdnderi, Hort.). 

 Dense round-headed bush with upright branches and 

 bluish gray foliage: Ivs. acicular, decussate, spreading, 

 about ^in. long, thickish, concave above and with a 

 green line in the middle, the lower Ivs. often acutish, 

 the upper ones obtuse. 



Chamaecyparis pisifera var. squarrSsa, Beissn. & 

 Hochst. (Retinispora squarrdsa, Sieb. & Zucc.). Fig. 

 893. A dense, pyramidal or round-headed bush or some- 



times small tree, with light bluish green foliage almost 

 silvery white when young, usually coloring violet in 

 winter: tips of branchlets nodding: Ivs. crowded, 

 spreading, very soft, bluish green above, silvery white 

 below. The most ornamental and graceful and the best 

 known of these juvenile forms. The intermediate form, 

 var. plumosa, Beissn. & Hochst. (Retinispora plumosa), 

 has smaller, subulate and suberect Ivs., and is much 

 planted, especially in its golden variegated form. See 

 Fig. 892, Vol. II. 



Chamascyparis thyoides var. ericoides, Sudw. 

 (Retinispora ericoides, Zucc.). Fig. 3369. Dense shrub, 

 of stiff, pyramidal or almost columnar habit, with 

 upright branches and bright green foliage, changing to 

 violet-red or brownish red in winter: Ivs. bright green 

 above, with 2 bluish lines below. This form is very dis- 

 tinct with its stiff, columnar habit, but is less common 

 in cult. The intermediate form, var. andelyensis, 

 Schneid. (Retinispora leptoclada, Hort.), shows also a 

 stiff, pyramidal habit and bears chiefly small, suberect or 

 almost scale-like Ivs., and occasionally branchlets with 

 spreading linear Ivs. Fig. 3369. 



Thuja occidentalis var. ericoides, Beissn. & Hochst. 

 (Retinispora ericoides, Hort. R. dubia, Carr.). Dense 

 broadly pyramidal or round-headed bush, with upright 

 branches and dull green foliage, changing to brownish 

 green in winter: Ivs. linear, soft grayish green beneath. 

 The intermediate form, var. Ellwangeriana, Beissn. 

 (Retinispora Ellwangeriana, Hort.), has usually two 

 kinds of Ivs., but the linear Ivs. are smaller than those 

 of the preceding form. 



Thuja orientalis var. decussata, Beissn. & Hochst. 

 (Retinispora juniperoldes, Carr. R. decussata, Hort. 

 R. squarrdsa, Hort.). Fig. 3369. Dense, round-headed 

 bush, with bluish green foliage changing to violet 

 or steel-color in winter: Ivs. rather rigid, bluish green, 

 spreading, concave and with a whitish line above. But 

 rarely cult, and not quite hardy N. The intermediate 

 form, var. meldensis, Laws. (Retinispora meldensis, 

 Hort.), has mostly acicular suberect Ivs. of the same 

 color as in the preceding var. andelyensis. 



These juvenile forms are valuable for formal garden- 

 ing, for rockeries, small gardens and wherever slow- 

 growing and dwarf conifers are desired. They are 

 short-lived and usually becomes unsightly when older. 

 They are all readily prop, by cuttings. See also Cham- 

 aecyparis and Thuya. 



R. decussata, Hort.=Thuja orientalis var. decussata. R. 

 dubia, Carr.=Thuja occidentalis var. ericoides. R. Ellwan- 

 geriana, Hort.=Thuja occidentalis var. Ellwangeriana. R. 

 ericoides, Zucc.=Chamsecyparis thyoides var. ericoides. R. 

 ericoides, Hort.=Thuja occidentalis var. ericoides. R. filicoides, 

 Hort.=Chamsecyparis obtusa var. filicoides. R. filifera, Stand.= 

 Chamsecyparis pisifera var filifera. R. juniperoides, Carr.= 

 Thuja orientalis var. decussata. R. leptoclada, Zucc.=Chamae- 

 cyparis pisifera var. squarrosa. R. leptoclada, Hort.=Chamse- 

 cyparis thyoides var. andelyensis. R. lycopodioides, Gord.=Cham- 

 secyparis obtusa var. lycopodioides. R. meldensis, Hort.=Thuja 

 orientalis var. meldensis. R. obtusa, Sieb. & Zucc.=Chamae- 

 cyparis obtusa. R. pisifera, Sieb. & Zucc.=Chamsecyparis pisifera. 

 R. rigida, Carr.=Thuja orientalis var. decussata. R. Sieboldii, 

 Hort.=Thuja orientalis var. decussata. R. squarrdsa, Sieb. & 

 Zucc.=Chamecyparis pisifera var. squarrosa. R. squarrdsa, 

 Hort.=Thuja orientalis var. decussata. ALFRED R EHDER . 



REYNOSIA (named for Dr. Alvaro Reynoso, 1830- 

 1888, a Cuban agricultural chemist). Rhamnacese. 

 Unarmed evergreen shrubs or trees, with rigid branches, 

 sparingly cultivated, possibly for its edible fruit. 



Leaves opposite, leathery, entire and emarginate; 

 stipules small and caducous: fls. small, perfect, yellow- 

 ish green, in sessile, axillary, umbel-like clusters; sepals 

 5, valvate spreading; petals wanting; stamens 5, 

 inserted on the margin of the fleshy disk; ovary almost 

 superior, 2-3-celled: drupe with a thin fleshy pulp and 

 a crustaceous stone. About 10 species, 1 in S. Fla. 



latifolia, Griseb. RED IRONWOOD. DARLING PLUM. 

 Slender tree, 20-25 ft. high: Ivs. oval, oblong, or subro- 

 tund, usually emarginate, 1-1 ^2 in. long, leathery; mar- 



