CISTACE^. 35 



the sepals and often the branches and peduncles canescently tomentose : 

 the primary or terminal flowers large, few or solitary, on peduncles about 

 as long as the flower ; secondary flowers axillary, very small, nearly sessile, 

 solitary or somewhat clustered on short leafy branches, the petals very 

 small or none, the outer sepals usually wanting. (^Torr.) H. ranmlijlorum 

 Mick. H. corijTnhosum Pursh. H. rosmaririifolium Pursh. Cislns Cana- 

 densis Linn. 



Sandy woods. Can. to Flor. W. to Miss. June — Au^. %. — Stem about 

 a foot high, at length branching. Primary flowers an inch in diameter, yellow ; 

 secondary ones often very numerous, with very minute capsules, in which stage 

 it has probably been mistaken for Lechea. I follow Torrey, Gray, and Darhng- 

 ton, in uniting the several supposed distinct species above named. 



Rock Rose. Frost Weed. 



2. H. carymbosum Mich: stem branching from the base, canescent; 

 flowers in terminal fastigiate cymes ; the primary ones on filiform peduncles 

 much longer than the flower, the petals nearly twice the length of the 

 calyx ; the secondary flowers in glomerate cymules, mostly apetalous, 3 — 10 

 androus ; sepals tomentose villous ; the inner ones oblong-ovate, acute, the 

 outer linear and obtuse ; leaves oblong-lanceolate, softly canescent beneath. 

 (Torr. (^ Crr.) 



Sandy fields. N. J. to Flor. April — May. %..—Stem about a foot high. 

 Flowers about as large as those of H. Canadense, from which it is quite distinct. 



Corymbose Rock Rose. 



2. LECHEA. Li7m.—Vm Weed. 

 (In honor of John Leche, a Swedish botanist.) 



Calyx 3-sepalled, with two outer bracts or sepals, persistent. 

 Petals 3, inconspicuous, lanceolate. Stamens 3 — 12, and often 

 thrice the number. Ovary 1, 3-sided. Stigmas 3, scarcely dis- 

 tinct. Capsule 3-celled, 3-valved, with as many inner valves 

 opposite the others. Seeds affixed to the dissepiment or nerve, 

 very few, often 8. 



1. L.^ villosa Ell. : radical branches prostrate, villose ; leaves oblong 

 lanceolate, raucronate, pilose ; panicle short, leafy ; flowers fasciculate-race- 

 mose, secund, on very short pedicels. L. major Mich. 



Dry woods. Can. to Flor. July. %. — Stem 1 — 2 feet high, erect. Leaves 

 on the radical branches opposite or vertieillate ; those on the stem alternate. 

 Flowers small, brown, in racemose clusters. Larger Pin Weed. 



2. L. minor Pursh. : nearly smooth ; stem assurgent ; leaves linear- 

 lanceolate and linear, acute ; panicle leafy ; branches elongated ; flowers on 

 short pedicels. 



Dry hills. Can. and N. S. July— Sept. %.—Stem 8—12 inches high. 

 Flowers browm. Fruit larger than in the former. Smaller Pin Weed. 



3. L, racemulosa Mich. : whole^lant covered with appressed pubescence ; 

 stem erect ; leaves linear, acute, ciUate ; panicle slender and very branching; 

 raceme naked ; flowers small, alternate, pedicellate. 



Sandy grounds. N. J. to Car. July. %. — PursJi. Perhaps only a variety 

 of the preceding. Bunch-flowered Pin Weed. 



