1624 



HYDRIASTELE 



HYDROCOTYLE 



beneficial. For potting soil, it likes rich loam, with 

 plenty of sharp sand and good drainage. The seeds and 

 seedlings should be treated more like the commercial 

 areca, i.e., Chrysalidocarpus lutcscciis. It forms a sin- 

 gle stem when only 3 feet high, and grows to a height 

 of 20 feet or more in cultivation. It is at its best when 



10 to 15 feet high. 

 When well estab- 

 hshed and pot- 

 bound it loves 

 high feeding, as 

 does Ch rysalido- 

 car pus lutescens. 

 (H. A. Siebrecht.) 

 Wendlandiana, 

 H. Wendl. & 

 Drude {Kentia 

 Wendlandiana, F. 

 MueU.). A tall 

 palm in nature 

 with the Ivs. 

 many feet long; 

 . segms. numerous, 

 unequal, the long- 

 est 1}2 ft-, the 

 upper ones con- 

 fluent at the base, 

 all denticulate at 

 the apex. Queens- 

 land. 



N. TAYLOR-t 



HYDRILLA 



(water plant with 

 whorledlvs.). Hy- 

 ■ drocharitacese. One 

 aquatic plant of 

 Cent. Eu., Asia 

 and Austral., 

 offered abroad as a water or aquarium subject. H. 

 verticillata, Casp. Forming large masses, leafy, sub- 

 merged, dioecious: Ivs. linear or oblong, serrulate or 

 entire, 4-8 in a whorl, very short ( M"? sin. long) : sterile 

 or male fls. sohtary and short-pedicelled in a sessile 

 spathe; sepals, petals and stamens 3: fertile or female 

 fls. 1-2 and sessile in the spathe; sepals and petals 3; 

 ovary extending beyond the spathe into a beak; stigmas 

 3: fls. very small; the male fls. detach and float. 



L. H. B. 

 HYDRO CHARIS (Greek, graceful water plant). 

 Hydrocharitacese. Frogbit. A monotypic genus, an 

 aquatic plant, grown in a few aquaria. It is found in 

 ditches and ponds in Eu. and Temp. Asia. H. Morsus- 

 ranae, Linn., has floating sts. resembling runners, 

 and tufts of radical Ivs. and submerged roots: Ivs. 

 stalked, roundish, with a heart-shaped base, rather 

 thick, about 2 in. across: peduncles of the staniinate 

 plant bearing 2-3 fls. on long pedicels, which spring 

 from a spathe of 2 thin bracts; petals 3, white, sta- 

 mens 3-12; spathe of the pistillate fls. sessile among 

 the Ivs. ; styles 6, with 2-cleft stigmas. For American 

 frogbit, see Limnohium. Hydrocharis dies in the fall, 

 but winter-buds (see similar buds of Elodea, Fig. 1391) 

 break off and sink when the old plants die. In spring, 

 or in the greenhouse or aquarium under genial condi- 

 tions, they start early into growth, the scales biu'sting 

 and a young If. developing and then the whole rises to 

 the surface. It is a very interesting plant. Its fine, 

 silky roots are beautiful and attractive in the aqua- 

 rium, as well as the soft, tender Ivs. and delicate fls. 



Wm. Thicker. 

 HYDROCLEIS {water key). Butomacea: Sometimes 

 spelled Hydrocleys. Water plants, one of which is 

 very useful for summer ponds and for aquaria. 



Floating: Ivs. broad, ovate to strap-shaped: fls. per- 



1934. Hydrocleis nymphoides. ( X ?i) 



feet, mostly large; sepals 3, coriaceous and persistent; 

 petals 3, thin and fugacious; stamens many or nu- 

 merous, the external sterile: carpels 3, rarely 4 or 6 or 

 even 8, lance-hnear, connate at base, gradually atten- 

 uate into the style. — The latest monograph (Buchenau, 

 Engler's Pflanzenreich, hft. 16, 1903) recognizes 3 

 species, from Brazil. The genus is sometimes united 

 with Limnocharis, from which it differs in having 

 definite rather than many carpels, and the papillose 

 introrse stigmas. 



nymphoides, Buchen. (H. Cdmmersonii, Rich. H. 

 Humboldtii, Endl. Limndcharis Humholdtii, Rich. L. 

 Cdmmersonii, Spreng. L. nymphoides, Mich. Stra- 

 tidtes nymphoides, Willd. Vespuccia Humboldtii, Pari.). 

 Water-Poppy. Fig. 1934. Perennial: st. prostrate and 

 rooting: Ivs. broad-cordate-oval, thick, mostly floating: 

 fls. and Ivs. arising from bracted nodes, both long- 

 stalked: fls. 2-2 '2 in. across, with 3 obovate-rounded 

 light yeUow petals: carpels 5-7, not united. Brazil, to 

 Buenos Ayres. B.M. 3248. B.R. 1640.— A handsome 

 plant with the yeUow fls. (lasting 1 day) standing well 

 above the water. In habit, remarkably like Limnan- 

 themum nymphoides. Grows well in an aquarium or in 

 shallow water. Continuous bloomer; not hardy to 

 frost. The cult, of Hydrocleis nymphoides is of the 

 simplest. When grown in tubs, fiO them in two-thirds 

 full of moderately rich soil, covering with sand and fiU 

 up with water. Two or 3 plants planted in the center 

 in a short time wUI furnish the tub with its bright 

 glossy green Ivs. and mmibers of its bright cheery yel- 

 low fls., which continue late in the season. In natural 

 ponds, planted on the edge, the plants grow very rapidly, 

 and spread over a large surface of water. In artificial 

 ponds, plant in tubs or boxes and place in shallow 

 water or stand the tub or box on some stand, allowing 

 6-9 in. depth of water. William Thicker. 



L. H. B. 



HYDROCOTYLE (Greek, water and cup; the plants 

 thrive in moist places, and the roundish leaves have 

 a cup-like depression in the middle). Umbelliferx. 

 Water Pennywort. Slender creeping perennials of 

 wet places, one of which is somewhat used in carpet- 

 bedding. 



Herbs, with round or reniform often peltate Ivs., 

 and scale-Uke stipules at the base of the petioles: fls. 



1935. Hydrocotyle rotundifolia. ( X 



very small, white, in umbels or umbel-like clusters 

 opposite the Ivs., sometimes 1 umbel appearing above 

 another; calyx-teeth minute; petals entire, concave: 

 fr. strongly compressed. — Species about 75, widely 

 distributed around the world, several being native in 

 the V. S. and Canada. 



rotundifolia, Roxbg. {H. sibthorpidtdes, Lem. Sib- 

 ihdrpia europ^a, Hort., not Linn.). Fig. 1935. Lvs. 



