1078 



DROSOPHYLLUM 



DRYOPTERIS 



5, obovate, thin, twisted after anthesis; styles 5, fili- 

 form: fr. a narrow caps., % in. long, 5-valved. B.M. 

 5796. The glands of this interesting plant are 

 purple, some stalked and some sessile, viscid, not 

 motile. See Diels, in Engler's Pflanzenreich, hft. 26 

 (1906) for monographic treatment, where the Drosera- 

 cese is reduced to 4 genera, Byblis and Roridula being 

 removed from the family; and Darwin studied it 

 and described it in Chap. XV of "Insectivorous 

 Plants." L. H. B. 



DRYAS (Greek, wood-nymph). Rosacese. Dwarf hardy 

 tufted evergreen somewhat shrubby plants, sometimes 

 transferred to gardens. 



Leaves alternate, petioled, simple, entire or crenate, 

 tomentose: fls. large, white or yellow, borne singly on 

 slender scapes; sepals 8-10, persistent; petals 8-10, 

 obovate or oval; stamens many, with subulate filaments; 

 pistils many, sessile, with a terminal style that persists 

 and elongates on the achene. High northern or moun- 

 tain plants, of N. Amer., Eu. and Asia, of which 4 spe- 

 cies are recognized by Rydberg ( N. Amer. Flora, xxii, 

 part 5, 1913) ; allied to Geum. 



The best known cult, species, D. octopetala, requires 

 a well-drained porous soil, a sunny but not dry posi- 

 tion. It is well to shade the foliage from bright sun 

 during the winter months with evergreen branches to 

 prevent the foliage from having a scorched appear- 

 ance. A capital plant for the rockery. Propagated 

 by cuttings, division, or by seed. (J. B. Keller.) 



octopetala, Linn. Densely cespitose with a woody 

 caudex or st.: Ivs. rugose, elliptic, oval or oblong, 

 deeply and regularly crenate, white-tomentose beneath : 

 scapes 2-8 in. long; fls. white, the petals elliptic or 

 obovate-elliptic, and the sepals linear or linear-lanceo- 

 late: seeds with a feathered awn 1 in. long. North 

 temperate and arctic regions. 



Drummondii, Rich. Cespitose perennial with decum- 

 bent caudex: Ivs. elliptic or obovate, white-tomentose 

 beneath but nearly or quite glabrous above, somewhat 

 rugose, coarsely crenate: fls. yellow, the petals elliptic- 

 spatulate or obovate and almost erect, the sepals ovate 

 or ovate-lanceolate. Que. to Ore. and N. B.M. 2972. 

 A good rockery plant; 4 in., more or less. 



D. integrifdlia, Vahl. Fls. white; sepals linear or linear-lanceo- 

 late: Ivs. lanceolate or lance-elliptic, the margins mostly revolute. 

 High northern N. Amer. D. tomentdsa, Farr. Fls. yellow; sepals 

 ovate or ovate-lanceolate: Ivs. obovate or elliptic, coarsely crenate, 

 tomentose on both surfaces. Canadian Rockies. I TT B 



DRYMOGLOSSUM (Greek, wood and tongue, of no 

 direct significance). Polypodiacese. Small ferns, 5 to 10 

 species, occurring wild in both tropics, with wide creeping 

 rootstalks, and small, entire Ivs. : sori resembling those 

 of Polypodium. None is advertised in Amer. Three 

 or 4 kinds are mentioned in horticultural literature 

 abroad, but are not cult. here. L M. UNDERWOOD. 



DRYMONIA (from Greek for an oak wood: growing 

 on trees). Gemeriaceae. Prostrate or climbing woody 

 plants, sometimes grown under glass, but apparently 

 not offered in this country. Fls. white or yellowish, 

 mostly large, on short axillary usually solitary pedicels; 

 calyx large, oblique, 5-parted; corolla-tube prominently 

 ventricose, declinate, gibbous or saccate at base, the 

 5 lobes broad and spreading and only slightly unlike; 

 stamens affixed in the base of the corolla, 4 perfect; 

 disk-glands large at rear, small or wanting in front; 

 style elongated: fr. fleshy, ovate, becoming 2-valved: 

 Ivs. opposite, thickish. Some 15 species in Cent, and 

 S. Amer., closely allied to Episcia. Warmhouse plants, 

 requiring the treatment of other gesneriads. One spe- 

 cies is offered abroad: D. Turridlvx, Hanst., from Costa 

 Rica: tall shrub: Ivs. broadly oVate, blistered, metallic- 

 colored: fls. large, white, pendulous, the lower lobe 

 toothed, calyx red. D. punctdta, Lindl.= Episcia 

 punctata. L H B 



DRYMOPHLCEUS (Greek words meaning oak and 

 smooth inner bark). Palmacese, tribe Arecese. Spine- 

 less pinnate palms, with slender medium caudices. 



Leaves terminal, equally pinnatisect, the segms. 

 cuneate-oblong or linear, broadly oblique, submem- 

 branaceous, 3- to many-nerved, the margins recurved 

 at the base; rachis scaly, 3-sided; sheath long: spadix 

 with a short peduncle and slender branches; spathes 2 

 or many, the lower one 2-crested. This genus contains 

 a tropical palm, with very distinct wedge-shaped Ifts. 

 and ornamental scarlet frs., borne every year. It 

 flowers when only a few feet high, and is suitable for 

 pot culture. Species 12. Australasia and the Pacific 

 isls. 



The chances are that most of the plants now known to 

 the American trade as D. olivseforrnis are really D. 

 appendiculata. The true D. olivaeformis is said to have 

 been offered by a few dealers as Ptychosperma Rumphii. 

 D. appendiculata was described and figured by William 

 Watson, in Garden and Forest, mistakenly as D. olivse- 

 forrnis, as explained in B.M. 7202. He adds, "Like all 

 the palms of this section of the border, Drymophlceus 

 requires a tropical moist house with abundance of 

 water at all times." G.C. II. 24:394. The plant 

 figured was about fourteen years old, 3 feet high, with 

 leaves about 3 feet long. The plant takes about six 

 months to mature its fruits. 



appendiculatus, Scheff. (Areca grdcilis, Giseke, not 

 Roxbg. or Thouars). St. 6-10 ft.: Ivs. terminal, 5-6 ft. 

 long, arching: Ifts. 14-20, wedge-shaped, raggedly cut, 

 serrate: spadix from between the Ivs., short-stalked, 

 about a foot long; the yellow buds and white fls. 

 make an attractive contrast at the flowering season 

 (June). Moluccas, New Guinea. B.M. 7202. G.F. 

 4:331. The D. olwseformis of most dealers not of 

 Martius. 



D. Moorednus, Hort. "An erect-growing palm with grayish 

 green Ivs." D. olivsefdrmis. Mart., not the trade plant of that 

 name, has narrower Ifts. than the above, and the fr. half immersed 

 in the greatly enlarged perianth. JARED Q SMITH _ 



N. TAYLOR. f 



DRYNARIA (Greek, oak-like). Polypodiacese. Some 

 10 or more E. Indian ferns, with round naked sori, 

 as in Polypodium, but with a fine network of netted 

 veins which are arranged in distinctly rectangular 

 meshes. The most distinctive feature is in the shape 

 of the Ivs. which are either of 2 sorts, as in Platycerium, 

 the cup If. having the shape of an oak If.; or the base 

 of each If. is separately lobed and oak-like. D. quer- 

 cifolia, with 2 sorts of Ivs., the spore-bearing 2-3 ft. 

 long, is the com'monest species. D. rigidula, Swartz (D. 

 diversifolia, R. Br.), a similar but larger species from 

 the same region also appeared at one time in the Ameri- 

 can trade, but the species are seldom seen in cult, in 

 this country. D. mussefblia is occasionally seen in fine 

 collections, where it is grown for its striking simple 

 foliage, which reminds one of the bird's nest fern 

 (Asplenium Nidus). It is really a Polypodium, which 

 see for description. R c. BENEDICT.! 



DRYOPTERIS (Greek, oak-fern). Polypodiacese. 

 WOOD-FERN. A widely distributed genus of handsome 

 ferns with dissected foliage, the native species some- 

 times grown in the hardy border and the tropical kinds 

 under glass. 



Plants bearing round sori either naked or covered 

 with heart-shaped or reniform indusia, which are fixed 

 at the center or along the sinus : veins either wholly free 

 or the lowest united. Several hundred species have 

 been referred to this genus. A considerable number of 

 our common woods ferns belong to this genus. The 

 species have been variously known under the names 

 Lastrea, Aspidium. and Nephrodium. Other species 

 sometimes referred to under this genus may be 

 found under Polystichum and under Lastrea. For D. 

 acrostichoides, see Polystichum; for D. decurrens, see 



