HYDROCOTYLE 



HYLOCEREUS 



1625 



shining, J^-l in. across, orbicular, cordate, subentire or 

 7-9-lobed to the middle or lower, doubly crenate": umbel 

 6-8-fld.: fr. 2-ribbed. Trop. Asia and Afr. Numerous 

 synonyms are accounted for by the variable length of 

 the petiole. Prostrate, rooting at the nodes. 



vulgaris, Linn., offered abroad: creeping or floating, 

 rooting at the nodes: Ivs. orbicular, 1 in. or less across, 

 crenate or slightly lobed, centrally attached, the peti- 

 oles surpassing the peduncles: fls. minute, white, in 2 

 or 3 whorls or in a single umbel: marshes and bogs, and 

 edges of ponds. Eu. L. H. B.f 



HYDROLEA (probably from water, because of the 

 habitat). Hydrophyllacese. Annual or perennial herbs 

 or subshrubs, scarcely cult., of warm countries and a 

 few in the U. S.; species perhaps a dozen: now often 

 included with Nama (which see) : branching plants, 

 sometimes spiny: Ivs. ovate or lanceolate, entire, pin- 

 nate-veined: fls. blue or white, in clusters or solitary; 

 corolla broadly campanulate or nearly rotate, 5-cleft; 

 stamens 5, about the length of the corolla, with fila- 

 ments dilated below: fr. a globular caps, with minute 

 seeds. Four species occur in the U. S.: H. corymbosa, 

 Ell. (Nama corymbdsum, Kuntze), with clustered blue 

 yellow-nerved fls. % m - across, and oblong to oblanceo- 

 late Ivs.: S. C. to Fla. H. quadrivdlvis, Walt. (H. 

 carolinidna, Michx. Nama quadrivdlvis, Kuntze), with 

 solitary or few-clustered blue or lilac fls., and h'near- 

 elliptic Ivs. : Va., south. H . ovdta, Nutt. (Nama ovdtum, 

 Brit.), with purplish or white fls. in leafy-bracted pani- 

 cles, and ovate or elliptic Ivs. Swamps, Mo. to La. and 

 Texas. H. affinis, Gray (Nama affine, Kuntze), with 

 violet fls. in few-fld. leafy clusters, and linear-elliptic Ivs. 

 Ind. and 111. to Miss, and Texas. L, jj, jj. 



HYDROPHYLLUM (Greek, water-leaf; application 

 obscure). Hydrophylldcese. WATER-LEAF. A half- 

 dozen or more American hardy herbaceous plants, 

 mostly perennial, suitable for wild gardens and for 

 colonizing in shady rich places. 



Plants with pinnate or palmately cut foliage and 

 cymose clusters of numerous small white, lilac, light 

 blue, purplish or violet fls. in early summer: floral 

 parts in 5's; calyx appendaged or not; corolla bell- 

 shaped, the tube within bearing a linear longitudinal 

 appendage opposite each lobe, with infolded edges, 

 forming a nectar-bearing groove; stamens and 2 styles 

 usually exserted: caps. 2-yalved, with 1-4 nearly globu- 

 lar seeds. Mostly in moist woods and copses. The per- 

 ennial species are useful for planting about remote bor- 

 ders of shrubbery, where they take care of themselves. 



A. Calyx appendaged with a reflexed lobe at each 



sinus: biennial. 



appendiculatum, Michx. Loosely branching, 1-2 ft., 

 hirsute with long spreading hairs: root-lvs. pinnately 

 5-7-parted; st.-lvs. palmately 5-7-angulated-lobed : 

 fls. violet or purple, the stamens little exserted. Vt., 

 south and west. 



AA. Calyx not prominently appendaged (often minutely 



appendaged in H. canadense): perennial. 



B. Lvs. pinnately cut. 



capitatum, Douglas. Tufted, about 9 in. high, with 

 fascicled fleshy roots: Ivs. softly hirsute or pubescent, 

 ovate or roundish, 5-7-parted, the divisions lobed and 

 cleft: fls. in close clusters, on peduncle shorter than 

 petiole, blue. Colo., west. 



occidentale, Gray. Pubescent, hirsute or sparingly 

 hispid, 1-2 ft.: divisions of the If. 7-15: fls. violet-pur- 

 ple, varying to white; peduncle longer than the petioles. 

 Calif., Ore. 



virginianum, Linn. Glabrous or nearly so, 1-2 % ft.: 

 Ivs. pinnately divided, the &-7 divisions ovate-lanceo- 

 late or oblong: fls. white or violet-purple, the peduncles 

 longer than the petioles. Quebec, west and south. 



BB. Lvs. palmately cut. 



canadense, Linn. Nearly smooth, 1-2^ ft.: Ivs. 

 5-7-lobed, rounded: fls. mostly greenish white, some- 

 times purplish the peduncles usually shorter than 

 petioles. B.R. 242. L. H. B. 



HYDRO SME (name probably refers to the wet or 

 aquatic habitat). Ardcese. By some held to be the 

 proper genus for Amorphophallus Rivieri (H. Rivieri, 

 Engl.); but in the latest monograph (Engler, Pflan- 

 zenreich, hft. 48, 1911) it is included in Amorphophal- 

 lus, as is also Corynophallus, constituting a section of 

 the genus. When kept distinct from Amorphophallus, 

 the separation is largely on technical characters of the 

 seeds. 



The section Corynophallus of the genus Amorpho- 

 phallus, as accepted by Engler, comprises only Amor- 

 phophallus leonensis, Lem. (Corynophallus Afzelii, 

 Hort. C. leonensis, Engl. Hydrosme leonensis, Engl.), 

 which is sometimes cult, in two or three forms (Vol. I, 

 p. 276): peduncle very stout, 3-8 in. high, from an 

 oblate tuber, bearing a pyriform erect spathe 6 in. high; 

 tube of spathe 1% in. diam, white; limb concave, 3^ 

 in. broad at about the middle, rounded at top; mouth of 

 spathe dark purple streaked with dirty white and bear- 

 ing a few roundish spots; lips of spathe black-purple, 

 incurved: spadix expanding toward the top so that it 

 nearly fills the spathe, brown and mottled: If. 1, appear- 

 ing after the fls., on an erect petiole 2-3 ft. high, the 

 blade about 12 in. across and trisect; primary segms. 

 1- or 2-pinnatifid, the ultimate segms. narrow-linear. 

 Sierra Leone, and adjacent regions. B.M. 7768. F.S. 

 2:161. G.C. 1872:1619. Var. spectdbilis, N.E. Br. 

 (Corynophallus Afzelii var. spectdbilis, Mast.), petiole 

 bearing obscure linear-oblong spots. Var. elegans, 

 N. E. Br. (C. Afzelii var. elegans, Mast.), petiole green, 

 segms. 2-pinnatisect, the ultimate segms. very narrow. 

 Var. latifolia, N. E. Br. (C. Afzelii var. latifolia, 

 Mast.), petiole green, segms. pinnatisect, the ulti- 

 mate segms. broader and confluent. This variable 

 species may be found only rarely in choice collections. 



L. H. B. 



HYDROTJENIA (Greek, water and band; referring 

 to a triangular glandular bar which secretes nectar). 

 Iriddcese. Four species of tender bulbs from Mexica 

 and Peru, more curious than beautiful, allied to 

 Tigridia. 



From Tigridia (with which the genus is sometimes 

 united), it is distinguished by the perianth-segms. 

 lacking a spreading blade, the perianth being campanu- 

 late; tube none; filaments united in a cylindrical 

 column as long as the anthers; ovary clavate, 3-celled: 

 sts. 1-3 ft., simple, or slightly branched above, bearing 

 1 or more Ivs. : cormous. 



Van Hotlttei, Baker. St. 2-3 ft. long, bearing 2-3 

 fls.: Ivs. lanceolate, plaited, the lower 1 ft. long: spathes 

 inflated, 2 in. long: outer segms. oblong, over 1 in. long, 

 greenish outside, inside dark brown, much veined, 

 yellowish at tip, very obtuse: inner segms. suborbicular, 

 half as long, pale lilac, somewhat veined. Mex. F.S. 

 21:2174 (as Tigridia Van Houttei). Conn said to be 

 eaten in its native region. L H. B. 



HYLOCEREUS (wood and Cereus). Cactdcese. A 

 high - climbing cactus, with stems three -angled or 

 -winged, adhering to walls and trees by numerous aerial 

 roots. 



Spines small, usually inconspicuous: fls. nocturnal, 

 usually very large, with red or greenish sepals, white or 

 pinkish petals : fr. large, spineless, covered with numer- 

 ous If.-like bracts. Some 16 species of this genus are 

 known, but only 1, and that under a wrong name, is 

 grown to any extent in this country. The species are 

 easily grown in hothouses, especially if given a wall to 

 climb upon. A very curious small-fld. species, H. 



