150 CISTACEvE. Heuanthemum. 



6. P. jimhriata (Banks): scales broadly cuneate, fleshy, carinate at the 

 middle within, crenately 5-toothc'd at the apex ; radical leaves on very long 

 petioles, biauriculate-reniform; the cauline one very small, cordate, sessile 

 above the middle of the slender scape ; petals fimbriate at the base, some- 

 what unguiculate. Hook. — K(£n. anil. hot. 1. p. 391; DC. prodr. I. p. 320; 

 Hook. ! hot. misc. 1. p. 43. t. 23, (f- fl. Bor.-Am,. 1. p. 84. 



N. W. Coast, Menzies. Elevated swamps in the Rocky Mountains, lat. 

 52"?-56°, Drummond! and lat. 41°, Nuttall ! — Rhizoraa somewhat creeping. 

 Scape 1-U foot high. Flowers smaller than in P. Caroliniana. 



Order XX. CISTACEiE. Juss, 



Sepals 5, persistent ; the two outer ones usually much smallest or 

 sometimes wanting ; the three inner imbricated and often somewhat 

 twisted in a3stivation. Petals 5 (rarely 3 or by abortion none), hypogy- 

 nous, mostly very fugitive, usually crumpled in aestivation and twisted 

 in a direction contrary to that of the sepals. Stamens indefinite, or 

 rarely kw, hypogynous, distinct : anthers short, innate. Ovary com- 

 posed of 3-5 united carpels : styles and stigmas mostly united into 

 one. Capsule 3-5-valved, loculicidal, 1-celled with parietal nerviform 

 placentae, or imperfectly 3-5-celled with dissepiments proceeding from 

 the middle of the valves and bearing the placentae at or near the axis ; 

 endocarp often separating from the exocarp. Seeds few or numerous, 

 orthotropous (veiy rarely somewhat anatropous). Embryo nearly 

 straight or spirally convolute, in the midst of mealy or somewhat cor- 

 neous albumen. — Herbs or low shrubs : pubescence simple or stellate. 

 Leaves simple and usually entire, opposite or alternate (the lowest 

 always opposite), with or without stipules. Flowers perfect, yellow, 

 white, or red, showy or sometimes inconspicuous. 



Mr. Spach, in his papnr entitled ' Description of some nciv Cistacece, published in 

 the first volume of the Companion to the Botanical Magazine, annouaces the some- 

 what curious fact, that a few Cistaceis have anatropous seeds, but without mention- 

 ino; in what plants this structure is found. We find anatropous seeds in Helianthe- 

 Tnum Fumana, H. procumbens, H. lajvipes, H. junipcrinum, and H. glutinosum 

 (which are all the species of the section fimiana of which we have specimens in 

 proper state for the examination) ; also in H. alpestre. In the two first-named spe- 

 cies the funiculus is adherent only for about half the length of the seed, which is thus 

 as it were heterotropous or amphitropous ; in the others it adheres almost to the 

 (organic) apex of the seed, but in H. Isevipes and H. glutinosum it may readily be 

 separated from the testa. I'he seeds of H. glutinosum, when thrown into water are 

 seen to be covered with a very dense coat of mucus, enveloping a great number of spi- 

 ral threads which uncoil when the mucus dissolves ; as in CoUomia linearis. 



1. HELIANTHEMUM. Toiirn. inst. t. 128 ; Gc^tn.fr. t. 76 5 DC. 



The two exerior sepals usually much smaller and bract-like, or wanting. 

 Petals 5 or rarely 3, sometimes abortive, fugitive. Stigmas 3, large, fimbrio- 

 late, more or less united into one. Capsule triangular, 3-valved, few- or 



