246 Order 18.— HTPBRICACE^. 



2. HELIANTHEMUM, L. Eock Rose. (Gr. rjXiog, the sun, dvdog, 

 flowei-.) 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. Cauad^nae Mx. Frost Plant. Hoary pube-scmt ; peialiferous fls. solitary, 

 pedicellate, terminal, apetalous ones axillary, small, clustered, subsessile ; cal. acute ; 

 lv3. 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 the apetalous fls. not larger than a pin's head. Sds. few, 

 brown. May — Sept. 



S. OBTUSA. Hoary tomentous; lvs. oblong, obtuse; fls. (all petaliferous?) 

 smaller (7" broad), several, tei'minal.' — Middle Plor. St. 3 — 6' high. Lvh. 

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



2 H. corymbosuin Mx. Canescently tomentous; fls. in crowded, fasiigiate a/rnvs. 

 tlie primary ones on elongated, filiform pedicels, and with petals twice longe-r than 

 the calyx; sep. villous canesoent, obtuse; las. oilong-lanceolate, margins raiolute. — 

 Sterile sands, N. J., to 3?la. Plant somewhat shrubby, very tomentous when 

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

 secondary ones apetalous, subse.ssile. Jn. — Aug. (Heteromeris cymosa Spach. ) 



3 H. Carolini^num Mx. Villous, simple, erect; fls. all large, petaliferrous and 

 subierminal ; sepals acuminate; lvs. oblong-oval, edges denticulate, not revolute.^ 

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

 brownish, 8 — 12' high. Lvs. distinctly petioled, 1 — 2 1' long, J- as wide, obtuse 

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

 supra-axillary. Apr., May. 



3. HUDSONIA, L. (In honor of William Hudson, author of Floi'a 

 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, oxstipulate leaves. 



1 H. tonient6.sa Nutt Hoary-?omentoK3 ; lvs. owate, appressed-imbricate, acute ; 

 fls. subsessile; sep. obtuse. — Shores of the ocean and lakes, Ke. 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, H. ericoides L. 'Hoo.Tj-pitbescent ; lvs. subulate, a little f prcading ; pedicels t-x- 

 serted, as long as the calyx; Sep. acutish. — A very delicate shrub. L. CJliamplain, 

 Vt., Conway Pond, N. H. to Va., along the coasts. St. Jf high, erect, with 

 numerous!, short, compound, procumbent bran<!he.?. Lvs. not more than 1' long. 

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



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

 than the flowers; sep. acuminate, the outer ones longer, subulate. — High Mts. o( 

 K Car. Sts. decumbent, 3^5' high. Lvs. partly imbricated, 2" long. Fla. 

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



Order XVIII. HYPERICACEJ3. Sr. John's wortb. 



Eerbs or shrubs with opposite, entire, dotted, exstipulate leaves, with flowers per- 

 fect, regular, hypogynous, 4 or6-merous, oymous and mostly yellow ; sepals uneqnsii, 



