52 JOURNAL OF THE ARNOLD ARBORETUM [vol. i 



overlapping, usually not distinctly distichous, more abruptly acuminate 

 at the apex, with the midrib prominent above and conspicuous beneath; 

 seed more compressed and with an elliptic hilum. 



PINACEAE 



Cupressus lusitanica Mill var. Knightiana, comb. nov. — Ciipressus 



rry 



Carricre, Traite 



Conif., ed. 2, 158 (18G7). — Cupressus elegans Low ex K. Koch, Dcndr. 

 II. pt. 2, 15G (1873), pro synon. — Cupressus Benthamii var. Knujhiiana 

 Masters in Jour. Linn. Soc. xxxi. 340, f. 15 (189G). — Mottet, Conif. Tax. 

 92, fig. 10 (1902). — Cupressus lusitanica var. Benthamii llenvy in Elwes & 

 Henry, Trees Gt. Brit. Irel, V. 1177 (1910), pro parte, non Carriore. 



This variety differs from the tjT>e chiefly in its distinctly pyramidal habit 

 and in its regularly pinnate branchlet-systeni with the ultimate branchlets 

 of nearly equal length and compressed; the leaves are acuminate and the 

 mucro of the cone-scales large and conical. Henry identifies C\ Knightiana 

 with his C. lusitanica var. Benthamii, but the latter differs, as far as I can 

 see, in the tetragonal, not or scarcely compresseil, somewhat thicker branch- 

 lets, with the ultimate branchlets though likewise disposed in one plane 

 less regular and not of almost equal length, 

 in both varieties from green to glaucous. 



Chamaecyparis obtusa f. tetragona, coml 



aurea Barron, Select. Cat. Conif. (opn. p. 



The color of the leaves varies 



Retinispora tetragona 

 i). — Chamaecyparis 



obtusa tetragona aurea Nicholson, Diet. Card. i. 304 (1884-8o). — Cupressus 

 obtusa tetragona-aurea Masters in Jour. Linn. Soc, xxxi. 355 (1896). 



The varietal name '' aurea " is preoccupied by C. obtusa aurea Fortune 

 apud Henckel & Hochstetter and as no other form named *' tetragona '' is 

 kno^\Tl, this name should be used for the form under consideration. 



X Larix Henryana, noni. nov. (L. decidua X Kaempferi). — Larix? 

 curopaca X leptolepis Ilenrj^ in Elwes & Henry ii. 388 (1907).^ Larix 

 hybrida Farquhar, Cat. New Rare PL 7 (1916), nomen. — Rchder in Bailey, 



Stand. Cycl. Hort. vi. 3569 (1917). 



Young branchlets yellowish, slightly bloomy; branchlets of the previous 

 season yellow or grayish yellow, lustrous; bud-scales at the base of the 

 shoots with scattered hairs inside; terminal buds conic-ovoid, red-brown, 

 the lowest scales aristate, lateral buds globose-ovoid, obtuse, resinous, buds 

 of spurs ovoid, their outer scales loose, with hairs at the base. Leaves glau- 

 cous, those of the spurs 2-5 cm. long, above with 1 or 2 lines of stomata on 

 eaf^h side, below with 3-5 lines on each side and keeled; those of the shoots 

 1.5-2.5 cm. long and about 1.5 mm. Inroad, acute and mucronate, above 

 with 2-4 lines on each side and below with 5-7 lines on each side, in cross- 

 section compressed-rhoml^ic, with a slightly raised midrib below. Cones 



not known. 



Larix Kaempferi Sarg. is chiefly distinguished from the hybrid by the 

 dense glaucous bloom covering the young branchlets and by the reddish 



color of the branchlets of the previous season, by the longer and broader 



