36 CHAPARRAL. 
which the trees are tall and slender. Although considered tolerant 
of shade, young trees growing in a dense stand of knobcone pines 
frequently die from overshading. The species coppices quickly after 
fire, thor ugh its slow growth would delay the establishment of a good 
cover. It is host for mistletoe, Phoradendron villosum. 
REPRESENTATION OF DESIRABLE AND UNDESIRABLE SPECIES OW 
TWO WATERSHEDS. 
The following table gives the results obtained by the late L. C. 
Miller, of the Forest Service, in a study to determine the proportion 
of desirable and undesirable species on the Tujunga and San Gabriel 
watersheds. The sample plot method described on page 24 was used. 

TABLE 5.—Composition of chaparral on Tujunga and San Gabriel watersheds. 














North slope. | South slope. 
Tujunga. | SanGabriel. | Tujunga. San Gabriel. 
Species. 
2,000 | 3,000 | 2,000 | 4,000 | 2,000 | 3,000 | 2,000 } 4,000 
to to to to to to to to 
3,000 | 5,000 | 4,000 | 6,000 | 3,000 | 5,000 | 4,000 | 6,000 
feet feet. | feet feet feet. feet. | feet feet 
| | | 
DESIRABLE SPECIES. 
Per ct.| Per ci.| Per ct. | Per ct. | Per cét. | Per ci. | Per ct. | Per ct. 
Arctostaphylos'tomento0Sa-= == -2--|22- =" aas)-2 2 0. 23 | oseseere||-o-2200- |= -\'-nn es Seeeenee 2. 35 
Arctostaphylos glauca. .-..-.--.------- IAT IY" PARSE | ceock eae jpcesuces|baSeesce 2 QO ee Scie. fas oe 
Heteromeles arbutifolia...........--- P30a| pesos 74 eee peeps tse ee aya? S| eee 
Prunus iliciolias ee ee | 5.10 | AGN) SDE eee |e Feaena | 24 213 
Quercus Chnysolepisse=== eae eee 3. 00 Ae 28a ote= eee pects [ecru = O2 Nee ee 2. 59 
Quercus 'dumosateeee see 13. 20 2.21) 34.66 |.-.--.-- [o-5% Scsaleenaasee ee esa ae fol 
| QUCLCHS WISHZONT= cases ee bp 9280 Sh 745) |lepoee aaa paescece Serer ees Gs el Pee Se 9. 58 
"Rhus daring eee eon eas ooek eee [fase OAD ate o ek ee | ee ae eee es 8 RS 87 Gs Metre an ee 
Rhus Ovates se: = ene oe ee oe eee es [eaters 7 AM (eee eee Pot j= tea . 04 | sy (| eae aie 
Quercus douglasii=: 2 == 5 = 60 |. ete ol? scam as borat | 2 eeees | eee [eee Ae 
Fremontodendron californicum.......|...----- SBE eeeeree Coenen nonin Bea ca ek 2. 67 
Morale a ea gee 46.20| 31.75| 40.04 ]........ | o7| 3.511 270| 19.68 
UNDESIRABLE SPECIES. 
Adenostoma fasciculatum............ 780"| = SIRS0 eee Rees 31.40 | 60.81] 29.91| 19.23 
Ceanothus crassifolius.........--.-.-- } 25.40] 13.30 . 23 Eee asee 1.31 | 13.90 45665 |S sso 
Ceanothus cuneatus. 2. 2222 652 oe se al 29 2s ee Pre eer ee 1.85 | asset aes . 78 
Ceanothus sorediatus.....-..--------- | AS 30 |) 2.24 |\WAAIG oso o= see eae . 33 | ee 14.18 
Ceanothus divaricatus............-../ Ra (1) eR hes Pas REE ae [2 kes [erwtce AL Weert hs .16 
Eriogonum fasciculatum..---.--.-.--- {Be SOn a 2250) | Sa aee ee | Scere oe 27. 60 7.40 | 19.11 16. 33 
Cercocarpus parvifolius.....--..----- | - 2.26 | IEG AR) 7A eee . 08 | By 7. al Beecece 
Eriodicyon glutinosum.......-...-.- Beate: JeSes Dy Ese Se eee | [1580 | es eee 
Eriodictyon tomentosum..........-- eet oe ae paste ss he as 2.18 | 1.26 | Lee ed eae ee 
Symphoricarpos mollis. ...........--- | 1.20 SU 4.27‘) eee eee ee . 78 
Rhus trilobata 222 ee See ee S71] eee] ied a ee ee 42 | Teed Wa or 
Mimultis bivipeS<- 22-2. eb ee oes | aoea as [eee | cee esces eee ofa ssc leccetene| ee eee 
Artemisia tridentata. .............--- eceeccec 30 |--....--)-------- Beeee a Mester |ees So eae) Ske Se 
Rhamus caliiommicare s2-s----- ae Bee SSe6e| Geecuere ESease oe eccer ses Hosec sos) Sece=cne stcsqbce - 08 
Gilivealifornicas so. sseoe) seen ae | 14 ESO): 42. 24.3 |ssoateee ese 1S iy eee . 86 
Walccaswhip plete. 2 eee cee | eee 671) ees | esos 4.00 6. 80 6. 13 5. 74 
Pentstemon cordifolius.............-- [Pacezca- S20 oe aw =~) seinen on aes at - 08 
Rhamnuswiciolizes = eee 2. 80 . 09 ete 2 |e ~$& . 06 . 24 4.08 
Sakviammelliorasee 25) 5 aetna 5s Bee Ameo! Serres 135.307 sS sa 7 a) hl ee 
Audibertia polystachya......-.....-- 000 |Sasa=os- lseoqetad socccese AS lessees LY iva ee wie 
Lotus plaber- 15) azote eae oe maar Pie |e ee I et 14.15 -02] 8 80]----.... 
Ceanothus intererrimus......---..--- Gassee=-|Sescsdec | (EMR: |\Sotcescn AOS eens aoe eee ae ete 
Fraxinus dipetala.........--.-------|--------|-------- 7. 26: |o2sscssd) sce see e et aeeees |e a eee eee 
Vicia americans Sse eee |: - cca mee ate mere [eed oe | eo ee Pee een Seeete | 
Clematis ligusticifolia.............--- jose oo eSel eres | 5..62'|. 2c SaeE ee See aes Mees Le meee 
Prunus emarginata Sa te eC eee rs) [Sen = ee eee (Ret geste a] (renee fee eee a 1.57 
‘Ribes speciosa. ss eee oe eee ee repeal passes ec lerdocsss|sctecsc se ees ees ea eee 
Rhus diversiloba...........-...--.-- Bpeecsrs| Sse =6O4 peeaores Seeeme os ososoe-| secesS- = fp) REE ES 
Artemisia califormica <5 3255. saen2 35 2 |aewse ae eeaeeoe eee ae cel eae. cteee ae ees leer Basasese 7. 07 
ae Eee 
| 
| 
Wotale 23222 62.35 Foe es eet 53. 80 De Peo OG' (8 tae 99.73 | 96 ‘9 | 97. 20 | 80. 37 
! | 



