TiLLJEA. CRASSULACE/E. 657 



ternate with them, not unguiculate, imbricate in xstivation, inserted 

 on the base of the calyx, sometimes connate into a monopctaloug 

 tube. Stamens as many as the petals and alternate with them, or 

 twice as many, inserted with the petals or adnato to their base : 

 filaments subulate or linear-filiform : anthers introrsc. A hypogy- 

 nous scale usually at the base ot" each carpel. Ovaries always 

 equal in number to the petals and opposite them, distinct, or rarely 

 more or less united, with numerous (or rarely few) ovules in 2 rows, 

 subulate with the persistent styles. Carpels follicular in fruit, 

 usually many-seeded, opening by the inner suture ; when combined, 

 the dehiscence anomalous. Seeds anatropous, with a membrana- 

 ceous often loose testa. Embryo straight in the axis of a thin 

 fleshy albumen. — Succulent or fleshy herbs, or sometimes sufiVuti- 

 cose plants, with simple exstipulate (rarely membranaceous) leaves. 

 Flowers usually cymose. 



Tribe I. CRASSULE^. DC. 

 Carpels (follicles) distinct, dehiscent by the inner suture. 



1. TILLiEA. Mich. gen. t. 20; Linn.; Endl. gen. p. 809. 



Sepals 3-4, united at the base. Petals 3-4, distinct. Stamens 3-4. Car- 

 pels 3-4, 2-many-seeded. — Small more or less a(|uatic annual herbs, with 

 opposite leaves, and small axillary (mostly wliite) flowers. 



§ 1. Parts of the floicer 3-4 : petals acuminate: hypogynous scales minute or 

 none: carpels 1-2-seeded, often constricted in the middle. — Till^ea, DC. 



1. T. minima (Miers) : stems diffuse, branching; leaves minute, connate, 

 oval-oblong; flowers vcrticillate and crowded in the axils of the leaves, on 

 short pedicels; petals 4, acuminate, shorter than the calyx; carpels 1-2- 

 seeded. Hool:. !<f Am.— ''Miers, Chil. 2. p. 530"; Hook. Sf Arn. hot. misc. 

 3. p. 338. T. erecta, Hook. S^- Am. hot. Bcechey, p. 24. 



St. Diego, California, Nuitall! — A few of I he pedicels are elongated so as 

 to exceed the leaves in length. Perhaps not different from T. rubescens, 

 H. B. &; K. 



§ 2. Parts of the flower \ : petals oval or oblong: hypogynous scales linear: 

 carpels Q-20-seeded. — Bulliarda, DC. 



■ 2. T. simplex (Nutt.) : stem erect or ascending, generally simple, rooting 

 at the base ; leaves linear-oblong, acutish or rather obtuse, connate at the 

 base; flowers solitary, nearly sessfle; petals (greenish-white) ami narrow 

 carpels twice the length of the sepals.— Nutt. ! in jour. acad. Philad. \. p. 

 114, S^- gen. appx. ; DC! j^rodr. 3. p. 381. T. ascendens, Eaton. 



Muddy banks of rivers, near New Haven, Connecticut! and Philadelphia! 

 July-Sept.— Stems 1-3 inches high. Leaves 2-3 lines long, at length 

 shorter than tlie internodes. Flowers the size of a small pin's head. Car- 



