Dicotyls or Exogenous P/ants. Ill 



Plan-ta'-go lan-ce-o-la'-ta L. Rib-grass: Ripple-grass; English Plan- 

 tain. — Scapes at length much longer than the lanceolate or lance-ob- 

 long leaves ; spike dense ; seeds 2. 



b. Brads linear, 2 or 3 tinirs as long as the jlowers ; leaves narrower}^ 



Plan-ta'-go ar-is-ta'-ta Mx. (P. patagonica var. aristata Gr.) Awned 

 Plantain. — Loosely hairy or green, or becoming glabrous; bracts nar- 

 nowly-linear, elongated; spike >^-4 in. long. 



A. Flowers siib-dia'cious or polyganio-cleistogamotis ; corolla of the fertile 

 flower closed over the maturing capsule forming a kind of beak; 

 sniall annuals' or biennials. 



Plan-ta'-go vir-gin'-i-ca L. Plantain. — Hairy or hoary-pubescent, 2-9 

 in. high; leaves oblong, varying to obovate and spatulate-lanceolate, 

 o to -j-nerved ; spikes 1-2 in. long. 



LXXXV. Order RU-BI-A'-CE->E. MADDER FAMILY.— Leaves simple, 

 entire, opposite or verticillate; ovary inferior; stamens epipetalous. 



Leaves opposite ; fruit a pod, small plants Houstonia. 1 



Leaves opposite or whorled ; fruit a pod ; large shrub Cephalanthus. 2 



Leaves opposite: frjiit a 2-eyed berry, plant creeping Milchella. 3 



Leaves whorled; fruit twin, of 2 1-seeded carpels ; herbs Galium. 4 



L Genus HOUS-TO'-NI-A. — Calyx 4-lobed, persistent; corolla salver- 

 form or funnel-form ; ovary 2-celled, 4-20 seeds in each cell ; stipules 

 short, entire, connecting the bases of the leaves; flowers dimorphic. 



A. Small, delicate: peduncle l-flozvei-ed, corolla salver-form. 



Hous-to'-ni-a cae-ru'-le-a L. Bluets; Innocence. — Leaves oblong- 

 spatulate, ;^>-4 lines long; corolla light-blue, pale-lilac or nearly white, 

 with a yellowish eye. 



A. Flowers i>i small terminal cymes or clusters ; corolla funnel-form. 



Hous-to'-ni-a pur-pu'-re-a L. Houstonia. — Pubescent or smooth, 8-15 

 in. high; leaves varying from roundish-ovate to lanceolate, :\-o ribbed; 

 calyx-lobes longer than the half-free, globtilar pod. 



Hous-to'-ni-a cil-i-o-la'-ta Gr. [H. purpurea va.r. ciliolata Q,x.) Hous- 

 tonia. — Leaves only Yz in. long, thickish, the cauline oblong-spatulate, 

 the radical oval or oblong, rosulate, hirsute-ciliolate. 



Hous-to'-ni-a lon-gi-fo'-li-a Gsertn. [H. purpurea var. longifolia Gr.) 

 Houstonia. — Mosth' glabrous, thinner-leaved ; leaves oblong-lanceolate 



