80 CISTACE.*:. (ROCK-nOSK FAMILY.) 



* ♦ ♦ Leiif-liearinrj throughout from an annual, biennial, or sometimeR short-lived 

 perennial root ; the stipules large, Iciif-like and lyrate-pinnatifid. 

 17. V. TRfcoLOR, L. (Pansy. He.vrt's-e.vsk.) Stem iingled and 

 branched ; leaves roundish, or the upper oval and the lowest heart-sluijied, 

 crenatc or entire; petals variable in color or varicfjated (yellow, whitish, 

 violet-blue and purple); — in var. auvensis shorter or little lon{::er than the 

 calvx. — Dry or sandy soil, New York to Illinois and southward: the variety 

 seeuiini; like a native plant. April -Sept. (Nat. from Eu.) 



OnPEU 14. CISTACE.E. (Rock-rose Family.) 



Low shrubs or herbs, icilh regular Jlowers, distinct and hgpogynous mostly 

 indefinite stamens, a persistent calyx, a l-celled Z - b-val ced pod with as 

 many parietal placentcE borne on the middle of the valves, and orthotropous 

 albuminous seeds. — Sepals 5 ; tlie two external often small, like bracts, 

 or sometimes wanting; the three others a little twisted in the bud. Petals 

 3 or 5, convolute in the opposite direction from the calyx in the bud. An- 

 thers short, innate, on slender fdaments. Style single or none. Ovules 

 few or many, on slender stalks, with the orifice at their apex. Embryo 

 long and slender, straightish or curved,' in mealy albumen : cotyledons 



narrow Leaves simple and mostly entire, the lower usually opposite, 



and the upper alternate. (Inert plants. A small family: mostly of the 

 Mediterranean region.) 



1. Helianlhcmum. Petals 5, crumpled in the bud, fugacious. StameDS and ovules nu- 



mcnms in tlie petiil-bearing flowers. 



2. Huflgoiiia. Petals 5, fugacious. Stamens 9-30. Style long and slender. Pod strictly 



]-celled, 2-6-seeded. 



3. LecUea. Petals 3, persistent Stamens 3 -12. Style none. Pixl partly 3-cdled, the im- 



perfect partitions bearing broad 2-seeded placentas. 



1. HELIANTHEMUM, Tourn. Rocic-rose. 



Petals 5, crumbled in the bud, fugjacious. Style short or none in our species : 

 stigma 3 lobed. Capsule strictly l-celled. Embryo curved in the Ibrm of a 

 hook or ring. — Flowers in most N. American species of tAvo sorts, viz., 1. tlic 

 primary or earlier ones, with large petals, indefinitely numerous stamens, and 

 many-seeded pods ; 2. secondai-y, or later ones, which arc much smaller and in 

 clusters, with small petals or none, 3-10 stamens, and much smaller 3 -few- 

 seeded pods. Tlie yellow flowers open only once, in sunshine, and cast their 

 petals by the next day. (Name from lyXtoy, the sun, and tw6(fxov,floirer.) 



I. H. Canaddnse, Michx. (Fkost-weed.) PitaJ-Ueuriug flowers soli- 

 tar g ; the smcdl srroiidarg floirers rlustered in the axils nfthe leaves, ncar\y sessile; 

 calyx of the large flowers hairy-])uhesccnt ; of the small ones hoary, like the 

 stem and lower side of the lanceolate ()l)l(mg leaves. — A variety is more hoary, 

 and with a stronger tendency to inultiply the minute clustered flowers. — Sandy 

 or gravelly dry soil, Maine to Wisconsin and southward. June - Aug. — Stems 

 at first simple. Corolla of the large flower» J' wide, producing pods 3' long; 



