246 ORDER 18. IIYPERICACE^E. 



2. HELIANTHEMUM, L. ROCK ROSE. (Gr. ffiiog, the sun, avBog, 

 flower.) Sepals 5, the 2 outer, smaller, the 3 inner convolute ; petals 5, 

 or rarely 3, convolute contrary to the sepals, sometimes abortive ; stam- 

 ens oo ; stigmas 3, scarcely distinct ; capsule triangular, 3-valved, open- 

 ing at top ; seeds angular. Fls. yellow often of 2 kinds, the later being 

 smaller and apetalous. 



1 H. Canadense MX. FROST PLAXT. Hoary pubescent ; pstaliferous fls. solitary, 

 pedicellate, terminal, apeialous ones axillary, small, clustered, subsessik; cal. acute; 

 Ivs. revolute on the margin, lanceolate, acute. In dry fields and woods, Can. to 

 Flor. St. 8 12' high, at length shrubby at base. Lvs. 8 12" long, J as wide, 

 entire, subsessile. Primary fls. with largo bright yellow petals. The axillary fls. 

 later, very small, with very small petals, or apetalous. Sta. declinate. Caps, 

 smooth, shining, those of tho apetalous 11s. not larger than a pin's head. Sds. few, 

 brown. May Sept. 



/?. OBTUSA. Hoary tomentous; Ivs. oblong, obtuse; fls. (all petaliferous ?) 

 smaller (7" broad), several, terminal. Middle Flor. St. 3 6' high. Lvs. 

 about 9" by 2 7 . Apr. It may prove distinct. 



2 H. corymbosum MX. Canescently tomentous; fls. in crowded, fastigiate cymes, 

 the primary ones on elongated, filiform pedicels, and with petals twice longer than 

 the calyx; sep. villous canescent, obtuse; Ivs. oblong-lanceolate, margins revolute. 

 Sterile sands, N. J., to Fla. Plant somewhat shrubby, very tomentous when 

 young, at length diffusely branched, about If high. Primary fls. 7 or 8" diam. ; 

 secondary ones apetalous, subsessile. Jn. Aug. (Heteromeris cymosa Spach. ) 



3 H. Carolinianum MX. Villous, simple, erect; fls. all large, petaliferous and 

 suUerminal; sepals acuminate-, Ivs. oblong-oval, edges denticulate, not revolute. 

 Dry woods, S. Car. to Fla. and La,, common. St. rarely branched from the base, 

 brownish, 8 12' high. Lvs. distinctly petioled, 1 2^' long, $ as wide, obtuso 

 or acute, black-dotted beneath. Fls. 1 to 4, more tlfan 1' broad, the pedicels 

 supra-axillary. Apr., May. 



3. HUDSONIA, L. (In honor of William Hudson, author of Flora 

 Anglica.) Sepals 3, united at base, subtended by 2 minute ones out- 

 side ; petals 5 ; stamens 9 30 ; style filiform, straight ; capsule, 1 -celled, 

 3-valved, many-seeded. Low shrubs with very numerous branches, and 

 minute, cxstipulate leaves. 



1 H. tomentcsa Nutt. Hoary-f omen tous ; Ivs. ovate, appressed-imbricate, acute ; 

 fls. subsessile ; sep. obtuse. Shores of the ocean and lakes, Me. to N. J. and Wis. 

 Plant consisting of numerous slender, ascending stems from the same root, and a 

 multitude of tufted branches, all covered with whitish down. Lvs. less than 1 ;/ 

 in length, closely appressed to the stem. Fls. about 2'' broad, yellow, numerous. 

 May. 



2 II. ericoides L. Hoary-pubescent; Ivs. subulate, a little spreading; pedicels ex- 

 serted, as Img as the calyx; sep. acutish. A very delicate shrub. L. C!\arnplain, 

 Yt., Conway Pond, N. II. to Va., along the coasts. St. -^f high, erect, with 

 numerous, short, compound, procumbent branches. Lvs. not more than 1' long. 

 Fls. yellow, about 3" broad. Caps, oblong, pubescent. May. 



3 H. montana Nutt. Minutely pubescent ; Ivs. filiform-subulate ; pedicels longer 

 than the flowers ; sep. acuminate, the outer ones longer, subulate. High Mts. of 

 N. Car. Sts. decumbent, 35' high. Lvs. partly imbricated, 2" long. Fls. 

 about 5" broad, the pedicels when in fruit 1' long. Caps, about 3-seeded. 



ORDER XVIII. IIYPERICACEJ2. ST. JOHN'S WORTS. 



Herbs cr shruls with opposite, entire, dotted, exstipulate leaves, with flowers per- 

 fect, regular, hypogynous, 4 or 5-merous, cymous and mostly yellow ; sepals unequal, 



