Oedeb 70.— ASTERWOKTS. 219 



M, ro'pens. Common in woods. Leaves round-ovate. Flowers white or pinkish. 

 Berries red, remaining through the winter. 



2. HOUSTO'NIA. Bluets. 



Oalyx tube round egg-shaped, 4-cleft, persistent. Corolla tubular, much 

 exceeding the calyx, limb i-lobed, spreading, filaments 4, on tbe corolla.. 

 Style 1. Capsule 2-lobed, half-free.— Herbs. Stipules connected to the 

 petiole. Flowers never yellow. 



§ Corolla salver-form, glabrous. Peduncles 1-flowered a 



§ Corolla funnel-form. Peduncles many-flowered, cyraous. . . .b 



a Flowers terminal. Small, delicate herbs 1,2 



a Flowers axillary. Small, delicate herbs 3,4 



b Leaves lance-ovate. Cymes terminal 5 > 



b Leaves lance-linear. Cymes terminal 6,7. 



1 H. coeru'lea. Dwarf Pinle. Stems very numerous, upright, 3-6'. Boot leaves 



ovate-spatulate. Flowers"pale blue. May, June. 



2 H. sarpyllifo'Iia. Thyme-leaved B. Stems thread-form, deonmbent, 6-12'. Leaves 



round-ovate, petiolate, fringed. Flowers on long stalks, pale. S. 



8 H. min'ima. Tiny B. Leaves linear-spatulate. Stems 1-3' high. Prairies. 



4 H. rotnndifo'Ma. Bound-leaved B. Lvs. roundish. Stems 2-5'. S. Mts. 

 5 H. purpu'rea. Prairie Innocence. Stems upright, much branched. If , with numer- 

 ous clusters of roseate or white, very delicate flowers. W. S. 



6 H. loiigifo'Iia, Long-leaved I. Stems 4-10', erect. Leaves oval-elliptic, 



narrowed to end. 



7 H. angustifo'lia. JVarrow-lea^ed I. Stems l-2f erect. Lvs. linear. Flowers 



numerous. W. S. 



Order LXX.— COMPOS'IT^. Asterworts. 



An immense family of heria or shruVby plants, with compound flowers, 

 that is, the flowers (or florets) collected into close heads upon a common 

 receptacle, and surrounded by an involucre of many bracts (called scales), 

 with 5 stamens which have their anthers united into a tube around the 

 style, with the calyx tube closely adhering to the 1 -celled ovary (an ache- 

 mum in fruit), and the calyx limb crowning the ovary in the form of a 

 'pappms consisting of scales, awns, bristles, or hairs, or else entirely want 

 ing ; the corolla consisting of 5 united petals, either strap-shaped (ligulate) 

 or tubular, and the style 2-cleft at the top. 



In this Order the pupil will remember that the heads are called radiate, 

 when the outer florets only have rays or are ligulate (see Fig. 498) ; radi- 



